strongswan: move ipsec.* to strongswan-ipsec

When building with strongswan-ipsec disabled, strongswan fails to build
because the ipsec.conf file does not exist. Fix this by moving the
ipsec.* files and directories to the strongswan-ipsec package.

Closes #10879 while keeping ipsec.conf to avoid breaking existing
setups, as opposed to #11709.

Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>

net/strongswan/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=strongswan
 PKG_VERSION:=5.8.2
-PKG_RELEASE:=2
+PKG_RELEASE:=3
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.bz2
 PKG_SOURCE_URL:=https://download.strongswan.org/ https://download2.strongswan.org/
@@ -447,17 +447,12 @@ CONFIGURE_ARGS+= \
 EXTRA_LDFLAGS+= -Wl,-rpath-link,$(STAGING_DIR)/usr/lib
 
 define Package/strongswan/conffiles
-/etc/ipsec.d/
-/etc/ipsec.conf
-/etc/ipsec.secrets
-/etc/ipsec.user
 /etc/strongswan.conf
 /etc/strongswan.d/
 endef
 
 define Package/strongswan/install
 	$(INSTALL_DIR) $(1)/etc
-	$(INSTALL_CONF) $(PKG_INSTALL_DIR)/etc/ipsec.conf $(1)/etc/
 	$(INSTALL_CONF) $(PKG_INSTALL_DIR)/etc/strongswan.conf $(1)/etc/
 	$(INSTALL_DIR) $(1)/usr/lib/ipsec
 	$(CP) $(PKG_INSTALL_DIR)/usr/lib/ipsec/libstrongswan.so.* $(1)/usr/lib/ipsec/
@@ -497,8 +492,16 @@ define Package/strongswan-charon-cmd/install
 	$(INSTALL_BIN) $(PKG_INSTALL_DIR)/usr/sbin/charon-cmd $(1)/usr/sbin/
 endef
 
+define Package/strongswan-ipsec/conffiles
+/etc/ipsec.d/
+/etc/ipsec.conf
+/etc/ipsec.secrets
+/etc/ipsec.user
+endef
+
 define Package/strongswan-ipsec/install
-	$(INSTALL_DIR) $(1)/usr/sbin
+	$(INSTALL_DIR) $(1)/etc/ $(1)/usr/sbin
+	$(INSTALL_CONF) $(PKG_INSTALL_DIR)/etc/ipsec.conf $(1)/etc/
 	$(INSTALL_BIN) $(PKG_INSTALL_DIR)/usr/sbin/ipsec $(1)/usr/sbin/
 endef