tcpdump: fix pcap-config issues

The patch removes a libpcap check to avoid a problem with libpcap. Fix
libpcap instead.

Modernize Makefile:

Use a normal autoconf bool instead of checking for CONFIG_IPV6.

Remove old configure and MAKE_FLAGS hacks. Removing them results in
compilation continuing to work without a problem.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

package/network/utils/tcpdump/Makefile

@@ -9,20 +9,19 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=tcpdump
 PKG_VERSION:=4.9.3
-PKG_RELEASE:=2
+PKG_RELEASE:=3
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=http://www.us.tcpdump.org/release/ \
 	http://www.tcpdump.org/release/
 PKG_HASH:=2cd47cb3d460b6ff75f4a9940f594317ad456cfbf2bd2c8e5151e16559db6410
 
-PKG_BUILD_PARALLEL:=1
-
 PKG_MAINTAINER:=Felix Fietkau <nbd@nbd.name>
 PKG_LICENSE:=BSD-3-Clause
 PKG_CPE_ID:=cpe:/a:tcpdump:tcpdump
 
 PKG_INSTALL:=1
+PKG_BUILD_PARALLEL:=1
 
 include $(INCLUDE_DIR)/package.mk
 
@@ -47,36 +46,18 @@ endef
 
 CONFIGURE_ARGS += \
 	--without-cap-ng \
-	--without-crypto
-
-ifeq ($(CONFIG_IPV6),y)
-CONFIGURE_ARGS += \
-	--enable-ipv6
-endif
+	--without-crypto \
+	$(call autoconf_bool,CONFIG_IPV6,ipv6)
 
 TARGET_CFLAGS += -ffunction-sections -fdata-sections
 TARGET_LDFLAGS += -Wl,--gc-sections
 
-CONFIGURE_VARS += \
-	BUILD_CC="$(TARGET_CC)" \
-	HOSTCC="$(HOSTCC)" \
-	td_cv_buggygetaddrinfo="no" \
-	ac_cv_linux_vers=$(LINUX_VERSION) \
-	ac_cv_header_rpc_rpcent_h=no \
-	ac_cv_lib_rpc_main=no \
-	ac_cv_path_PCAP_CONFIG=""
-
-MAKE_FLAGS :=
-
 ifeq ($(BUILD_VARIANT),mini)
   TARGET_CFLAGS += -DTCPDUMP_MINI
   CONFIGURE_ARGS += --disable-smb
   MAKE_FLAGS += TCPDUMP_MINI=1
 endif
 
-MAKE_FLAGS += \
-	CCOPT="$(TARGET_CFLAGS)" INCLS="-I. $(TARGET_CPPFLAGS)"
-
 define Package/tcpdump/install
 	$(INSTALL_DIR) $(1)/usr/sbin
 	$(INSTALL_BIN) $(PKG_INSTALL_DIR)/usr/sbin/tcpdump $(1)/usr/sbin/

package/network/utils/tcpdump/patches/002-remove_static_libpcap_check.patch

@@ -1,92 +0,0 @@
---- a/configure
-+++ b/configure
-@@ -5395,37 +5395,6 @@ $as_echo "Using $pfopen" >&6; }
- 		    LIBS="$LIBS $pfopen"
- 	    fi
-     fi
--	libpcap=FAIL
--	{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for local pcap library" >&5
--$as_echo_n "checking for local pcap library... " >&6; }
--
--# Check whether --with-system-libpcap was given.
--if test "${with_system_libpcap+set}" = set; then :
--  withval=$with_system_libpcap;
--fi
--
--	if test "x$with_system_libpcap" != xyes ; then
--		lastdir=FAIL
--    	places=`ls $srcdir/.. | sed -e 's,/$,,' -e "s,^,$srcdir/../," | \
--		egrep '/libpcap-[0-9]+\.[0-9]+(\.[0-9]*)?([ab][0-9]*|-PRE-GIT)?$'`
--    	places2=`ls .. | sed -e 's,/$,,' -e "s,^,../," | \
--		egrep '/libpcap-[0-9]+\.[0-9]+(\.[0-9]*)?([ab][0-9]*|-PRE-GIT)?$'`
--    	for dir in $places $srcdir/../libpcap ../libpcap $srcdir/libpcap $places2 ; do
--	    	basedir=`echo $dir | sed -e 's/[ab][0-9]*$//' | \
--	        	sed -e 's/-PRE-GIT$//' `
--	    	if test $lastdir = $basedir ; then
--		    			    	continue;
--	    	fi
--	    	lastdir=$dir
--	    	if test -r $dir/libpcap.a ; then
--		    	libpcap=$dir/libpcap.a
--		    	d=$dir
--		    		    	fi
--		done
--	fi
--    if test $libpcap = FAIL ; then
--	    { $as_echo "$as_me:${as_lineno-$LINENO}: result: not found" >&5
--$as_echo "not found" >&6; }
- 
- 	    #
- 	    # Look for pcap-config.
-@@ -5581,51 +5550,6 @@ if test "x$ac_cv_lib_pcap_main" = xyes;
-   libpcap="-lpcap"
- fi
- 
--		if test $libpcap = FAIL ; then
--		    as_fn_error $? "see the INSTALL doc for more info" "$LINENO" 5
--		fi
--																																								{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for extraneous pcap header directories" >&5
--$as_echo_n "checking for extraneous pcap header directories... " >&6; }
--		if test \( ! -r /usr/local/include/pcap.h \) -a \
--			\( ! -r /usr/include/pcap.h \); then
--		    if test -r /usr/local/include/pcap/pcap.h; then
--			d="/usr/local/include/pcap"
--		    elif test -r /usr/include/pcap/pcap.h; then
--			d="/usr/include/pcap"
--		    fi
--		fi
--		if test -z "$d" ; then
--		    { $as_echo "$as_me:${as_lineno-$LINENO}: result: not found" >&5
--$as_echo "not found" >&6; }
--		else
--		    V_INCLS="-I$d $V_INCLS"
--		    { $as_echo "$as_me:${as_lineno-$LINENO}: result: found -- -I$d added" >&5
--$as_echo "found -- -I$d added" >&6; }
--		fi
--	    fi
--    else
--	    V_PCAPDEP=$libpcap
--	    places=`ls $srcdir/.. | sed -e 's,/$,,' -e "s,^,$srcdir/../," | \
--    	 		egrep '/libpcap-[0-9]*.[0-9]*(.[0-9]*)?([ab][0-9]*)?$'`
--	    places2=`ls .. | sed -e 's,/$,,' -e "s,^,../," | \
--    	 		egrep '/libpcap-[0-9]*.[0-9]*(.[0-9]*)?([ab][0-9]*)?$'`
--            pcapH=FAIL
--	    if test -r $d/pcap.h; then
--                    pcapH=$d
--	    else
--                for dir in $places $srcdir/../libpcap ../libpcap $srcdir/libpcap $places2 ; do
--                   if test -r $dir/pcap.h ; then
--                       pcapH=$dir
--                   fi
--                done
--            fi
--
--            if test $pcapH = FAIL ; then
--                    as_fn_error $? "cannot find pcap.h: see INSTALL" "$LINENO" 5
-- 	    fi
--            V_INCLS="-I$pcapH $V_INCLS"
--	    { $as_echo "$as_me:${as_lineno-$LINENO}: result: $libpcap" >&5
--$as_echo "$libpcap" >&6; }
- 	    # Extract the first word of "pcap-config", so it can be a program name with args.
- set dummy pcap-config; ac_word=$2
- { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5