perl: Have perl's major version number in one central place

This will simplify updating the package in the future.

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

lang/perl/Makefile

 PKG_RELEASE:=3
 
 PKG_SOURCE_URL:=ftp://ftp.cpan.org/pub/CPAN/src/5.0 \
-		http://www.cpan.org/src/5.0/perl-5.20.0.tar.gz \
+		http://www.cpan.org/src/5.0 \
 		ftp://ftp.mpi-sb.mpg.de/pub/perl/CPAN/src/5.0 \
 		http://ftp.mpi-sb.mpg.de/pub/perl/CPAN/src/5.0 \
 		ftp://ftp.gmd.de/mirrors/CPAN/src/5.0 \
 endef
 
 define Build/InstallDev
-	$(INSTALL_DIR) $(1)/usr/lib/perl5/5.20
-	$(CP) $(PKG_INSTALL_DIR)/usr/lib/perl5/5.20 $(1)/usr/lib/perl5/
+	$(INSTALL_DIR) $(1)/usr/lib/perl5/$(PERL_VERSION)
+	$(CP) $(PKG_INSTALL_DIR)/usr/lib/perl5/$(PERL_VERSION) $(1)/usr/lib/perl5/
 endef
 
 define Package/perl/install
 	$(INSTALL_BIN) $(PKG_INSTALL_DIR)/usr/bin/perl$(PKG_VERSION) $(1)/usr/bin
 	ln -nsf perl$(PKG_VERSION) $(1)/usr/bin/perl
 	
-	$(INSTALL_DIR) $(1)/usr/lib/perl5/5.20/CORE
-	$(CP) $(PKG_INSTALL_DIR)/usr/lib/perl5/5.20/CORE/libperl.so $(1)/usr/lib/perl5/5.20/CORE/
+	$(INSTALL_DIR) $(1)/usr/lib/perl5/$(PERL_VERSION)/CORE
+	$(CP) $(PKG_INSTALL_DIR)/usr/lib/perl5/$(PERL_VERSION)/CORE/libperl.so $(1)/usr/lib/perl5/$(PERL_VERSION)/CORE/
 endef
 
 
 	$(INSTALL_DIR) $(1)/$(PERL_TESTSDIR)
 	$(INSTALL_DIR) $(1)/$(PERL_TESTSDIR)/Porting
 	$(INSTALL_DIR) $(1)/$(PERL_TESTSDIR)/regen
-	$(INSTALL_DIR) $(1)/usr/lib/perl5/5.20/XS
-	$(INSTALL_DIR) $(1)/usr/lib/perl5/5.20/auto/XS
-	$(INSTALL_DIR) $(1)/usr/lib/perl5/5.20/unicore
+	$(INSTALL_DIR) $(1)/usr/lib/perl5/$(PERL_VERSION)/XS
+	$(INSTALL_DIR) $(1)/usr/lib/perl5/$(PERL_VERSION)/auto/XS
+	$(INSTALL_DIR) $(1)/usr/lib/perl5/$(PERL_VERSION)/unicore
 	
 	$(CP) $(PKG_BUILD_DIR)/t $(1)/$(PERL_TESTSDIR)
 	$(CP) $(PKG_BUILD_DIR)/Porting $(1)/$(PERL_TESTSDIR)
 	$(CP) $(PKG_BUILD_DIR)/TestInit.pm $(1)/$(PERL_TESTSDIR)
 	$(CP) $(PKG_BUILD_DIR)/vutil.c $(1)/$(PERL_TESTSDIR)
 	$(CP) $(PKG_BUILD_DIR)/vxs.inc $(1)/$(PERL_TESTSDIR)
-	$(CP) $(PKG_BUILD_DIR)/lib/XS $(1)/usr/lib/perl5/5.20/
-	$(CP) $(PKG_BUILD_DIR)/lib/auto/XS $(1)/usr/lib/perl5/5.20/auto
-	$(CP) $(PKG_BUILD_DIR)/lib/vmsish.pm $(1)/usr/lib/perl5/5.20/
-	$(CP) $(PKG_BUILD_DIR)/lib/unicore/TestProp.pl $(1)/usr/lib/perl5/5.20/unicore
+	$(CP) $(PKG_BUILD_DIR)/lib/XS $(1)/usr/lib/perl5/$(PERL_VERSION)/
+	$(CP) $(PKG_BUILD_DIR)/lib/auto/XS $(1)/usr/lib/perl5/$(PERL_VERSION)/auto
+	$(CP) $(PKG_BUILD_DIR)/lib/vmsish.pm $(1)/usr/lib/perl5/$(PERL_VERSION)/
+	$(CP) $(PKG_BUILD_DIR)/lib/unicore/TestProp.pl $(1)/usr/lib/perl5/$(PERL_VERSION)/unicore
 	$(CP) files/perl-run_tests.sh $(1)/$(PERL_TESTSDIR)/run_tests.sh
-	sed -e 's!%%PERL_DISABLEDTESTS%%!$(PERL_DISABLEDTESTS)!' -i $(1)/$(PERL_TESTSDIR)/run_tests.sh
+	sed \
+		-e 's!%%PERL_DISABLEDTESTS%%!$(PERL_DISABLEDTESTS)!' \
+		-e 's!%%PERL_VERSION%%!$(PERL_VERSION)!' \
+		-i $(1)/$(PERL_TESTSDIR)/run_tests.sh
 	$(CP) $(PKG_BUILD_DIR)/config_h.SH $(1)/$(PERL_TESTSDIR)
 	$(CP) $(PKG_BUILD_DIR)/perl.h $(1)/$(PERL_TESTSDIR)
 endef

lang/perl/files/perl-run_tests.sh

 #!/bin/sh
 
 PERL_TESTSDIR="/usr/share/perl/perl-tests"
-PERL_LIBDIR="/usr/lib/perl5/5.20/"
+PERL_LIBDIR="/usr/lib/perl5/%%PERL_VERSION%%/"
 PERL_DISABLEDTESTS="%%PERL_DISABLEDTESTS%%"
 
 if [ ! -f "$PERL_TESTSDIR/__prepared" ]; then

lang/perl/perlmod.mk

 # This makefile simplifies perl module builds.
 #
 
+PERL_VERSION:=5.20
+
 # Build environment
 HOST_PERL_PREFIX:=$(STAGING_DIR_HOST)/usr
 ifneq ($(CONFIG_USE_GLIBC),)
 	EXTRA_LIBS:=bsd
 	EXTRA_LIBDIRS:=$(STAGING_DIR)/lib
 endif
-PERL_CMD:=$(STAGING_DIR_HOST)/usr/bin/perl5.20.0
+PERL_CMD:=$(STAGING_DIR_HOST)/usr/bin/perl$(PERL_VERSION).0
 
 MOD_CFLAGS_PERL:=-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 $(TARGET_CFLAGS) $(TARGET_CPPFLAGS)
 ifdef CONFIG_PERL_THREADS
 endif
 
 # Module install prefix
-PERL_SITELIB:=/usr/lib/perl5/5.20
+PERL_SITELIB:=/usr/lib/perl5/$(PERL_VERSION)
 PERL_TESTSDIR:=/usr/share/perl/perl-tests
 PERLBASE_TESTSDIR:=/usr/share/perl/perlbase-tests
 PERLMOD_TESTSDIR:=/usr/share/perl/perlmod-tests
 		LINKTYPE=dynamic \
 		DESTDIR=$(PKG_INSTALL_DIR) \
 	);
-	sed 's!^PERL_INC = .*!PERL_INC = $(STAGING_DIR)/usr/lib/perl5/5.20/CORE/!' -i $(PKG_BUILD_DIR)/Makefile
+	sed 's!^PERL_INC = .*!PERL_INC = $(STAGING_DIR)/usr/lib/perl5/$(PERL_VERSION)/CORE/!' -i $(PKG_BUILD_DIR)/Makefile
 endef
 
 define perlmod/Compile