perl: substitute perlcross pod with perl-version-specific pod

As suggested by Dan Pattison at ethertek ca.

Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/perl/perl.mk

@@ -13,8 +13,11 @@ PERL_LICENSE_FILES = Artistic
 PERL_INSTALL_STAGING = YES
 
 PERL_CROSS_VERSION = 0.7
+PERL_CROSS_BASE_VERSION = 5.$(PERL_VERSION_MAJOR).0
 PERL_CROSS_SITE    = http://download.berlios.de/perlcross
-PERL_CROSS_SOURCE  = perl-5.$(PERL_VERSION_MAJOR).0-cross-$(PERL_CROSS_VERSION).tar.gz
+PERL_CROSS_SOURCE  = perl-$(PERL_CROSS_BASE_VERSION)-cross-$(PERL_CROSS_VERSION).tar.gz
+PERL_CROSS_OLD_POD = perl$(subst .,,$(PERL_CROSS_BASE_VERSION))delta.pod
+PERL_CROSS_NEW_POD = perl$(subst .,,$(PERL_VERSION))delta.pod
 
 # We use the perlcross hack to cross-compile perl. It should
 # be extracted over the perl sources, so we don't define that
@@ -32,6 +35,11 @@ define PERL_CROSS_EXTRACT
 endef
 PERL_POST_EXTRACT_HOOKS += PERL_CROSS_EXTRACT
 
+define PERL_CROSS_SET_POD
+	$(SED) s/$(PERL_CROSS_OLD_POD)/$(PERL_CROSS_NEW_POD)/g $(@D)/Makefile
+endef
+PERL_POST_PATCH_HOOKS += PERL_CROSS_SET_POD
+
 ifeq ($(BR2_PACKAGE_BERKELEYDB),y)
     PERL_DEPENDENCIES += berkeleydb
 endif