perl: when Makefile.PL fails give more feedback

There are a few packages which mysteriously fail during the configure
stage.  Give us better means of understanding why.

Also, some Makefile.PL's have "use" statements which reference
files which are in or under ".".

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

lang/perl/perlmod.mk

@@ -57,7 +57,7 @@ define perlmod/Configure
 	(cd $(if $(3),$(3),$(PKG_BUILD_DIR)); \
 	PERL_MM_USE_DEFAULT=1 \
 	$(2) \
-	$(PERL_CMD) -MConfig -e '$$$${tied %Config::Config}{cpprun}="$(GNU_TARGET_NAME)-cpp -E"; do "./Makefile.PL"' \
+	$(PERL_CMD) -MConfig -e '$$$${tied %Config::Config}{cpprun}="$(GNU_TARGET_NAME)-cpp -E"; unshift(@INC, "."); unless (defined (do "./Makefile.PL")) { if ($$$$@) { die "couldn\047t parse Makefile.PL: $$$$@"; } else { die "couldn\047t do Makefile.PL: $$$$!"; } }; die "No Makefile generated!" unless -f "Makefile";' \
 		$(1) \
 		AR=ar \
 		CC=$(GNU_TARGET_NAME)-gcc \