perl: Set gccversion configuration symbol correctly

This was previously manually set to '4.8.0'. Aside from just being incorrect,
it also breaks Errno's GCC5 detection.

Fixes #2044.

Signed-off-by: Marcel Denia <naoir@gmx.net>

lang/perl/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=perl
 PKG_VERSION:=5.22.0
-PKG_RELEASE:=4
+PKG_RELEASE:=5
 
 PKG_SOURCE_URL:=ftp://ftp.cpan.org/pub/CPAN/src/5.0 \
 		http://www.cpan.org/src/5.0 \
@@ -93,6 +93,7 @@ endef
 # Target perl
 define Build/Configure
 	$(PERL_CMD) files/perlconfig.pl -Dowrt:target_cc='$(TARGET_CC)' \
+	                                -Dowrt:gccversion=$(CONFIG_GCC_VERSION) \
 	                                -Dowrt:target_cross='$(TARGET_CROSS)' \
 	                                -Dowrt:cflags='$(TARGET_CFLAGS_PERL) $(TARGET_CPPFLAGS_PERL)' \
 	                                -Dowrt:ldflags='-rdynamic $(TARGET_LDFLAGS)' \

lang/perl/files/README.config

@@ -45,6 +45,7 @@ owrt:threads          yes/no              Whether to enable threading support.
 owrt:ipv6             define/undef        Whether to enable IPv6 support.
 owrt:target_cross     *                   Target architecture's host triplet.
 owrt:target_cc        *                   C compiler to use.
+owrt:gccversion       *                   target_cc's version number.
 owrt:cflags           *                   Additional C compiler flags.
 owrt:ldflags          *                   Additional linker flags.
 owrt:staging_dir      *                   Same as OpenWRT buildroot's

lang/perl/files/misc.config

@@ -1,6 +1,6 @@
 cf_email='naoir@gmx.net'
 osvers='3.18.19'
-gccversion='4.8.0'
+gccversion="$owrt:gccversion"
 myhostname='OpenWrt'
 cf_time='Thu Jan 1 12:00:00 CEST 2015'