perlmod: fix ability to build module out-of-feed

Signed-off-by: Philip Prindeville <philipp@redfish-solutions.com>

lang/perl/Makefile

@@ -11,7 +11,7 @@ include perlver.mk
 
 PKG_NAME:=perl
 PKG_VERSION:=$(PERL_VERSION)
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE_URL:=\
 		https://cpan.metacpan.org/src/5.0 \

lang/perl/perlmod.mk

@@ -1,7 +1,11 @@
 # This makefile simplifies perl module builds.
 #
 
-include ../perl/perlver.mk
+ifeq ($(origin PERL_INCLUDE_DIR),undefined)
+  PERL_INCLUDE_DIR:=$(dir $(lastword $(MAKEFILE_LIST)))
+endif
+
+include $(PERL_INCLUDE_DIR)/perlver.mk
 
 ifneq ($(PKG_NAME),perl)
   PKG_VERSION:=$(PKG_VERSION)+perl$(PERL_VERSION2)