mg: fix arc build fail

fix arc (uClibc) build fail

Signed-off-by: Hirokazu MORIKAWA <morikw2@gmail.com>

utils/mg/Makefile

@@ -6,7 +6,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=mg
 PKG_VERSION:=20180927
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=https://github.com/ibara/mg/releases/download/mg-20180927

utils/mg/patches/001-cross_compile_openwrt.patch

@@ -1,6 +1,7 @@
---- a/configure
-+++ b/configure
-@@ -3,53 +3,6 @@
+diff -urN a/configure b/configure
+--- a/configure	2018-09-28 01:38:31.000000000 +0900
++++ b/configure	2019-05-22 15:17:05.722101952 +0900
+@@ -3,52 +3,7 @@
  # This configure script written by Brian Callahan <bcallah@openbsd.org>
  # and released into the Public Domain.
  
@@ -50,33 +51,39 @@
 -  done
 -  return 1
 -}
--
++cc="$CC"
+ 
  fgetlncheck() {
    cat << EOF > conftest.c
- #include <stdio.h>
-@@ -162,21 +115,6 @@
+@@ -162,18 +117,19 @@
    fi
  }
  
 -wflagcheck() {
--  cat << EOF > conftest.c
++futimenscheck() {
+   cat << EOF > conftest.c
 -int main(void){return 0;}
--EOF
++#include <sys/stat.h>
++#include <stddef.h>
++int main(void){futimens(0, NULL);return 0;}
+ EOF
 -  $cc -w -o conftest conftest.c > /dev/null 2> conftest.err
 -  grep ':' conftest.err > /dev/null 2>&1
--  if [ $? -eq 0 ] ; then
++  $cc $tflags -o conftest conftest.c > /dev/null 2>&1
+   if [ $? -eq 0 ] ; then
 -    rm -f conftest conftest.err conftest.c
 -    return 1
 -  else
 -    rm -f conftest conftest.err conftest.c
--    return 0
--  fi
--}
--
- # Option variables
- if [ ! -z "$PREFIX" ] ; then
-   prefix="$PREFIX"
-@@ -241,53 +179,9 @@
++    rm -f conftest conftest.c
+     return 0
++  else
++    rm -f conftest conftest.c
++    return 1
+   fi
+ }
+ 
+@@ -241,53 +197,9 @@
    ldflags="${ldflags}-static"
  fi
  
@@ -133,3 +140,19 @@
  
  cat << EOF > config.h
  /* This file generated automatically by configure.  */
+@@ -370,6 +282,15 @@
+   echo "no"
+ fi
+ 
++printf "checking for futimens... "
++futimenscheck
++if [ $? -eq 0 ] ; then
++    echo "#define HAVE_FUTIMENS" >> config.h
++    echo "yes"
++else
++    echo "no"
++fi
++
+ printf "creating Makefile... "
+ cat << EOF > Makefile
+ # This Makefile automatically generated by configure.