Mk/Uses: Add new pathfix expression

While working on Apertium ecosystem it looks like their entire 500+
applications uses hardcoded pkgconfigdir with (prefix)/share/pkgconfig.
This patch adds that regex for easier porting for the huge pile of
ports.

Reviewed by:	tcberner
Approved by:	portmgr
Differential Revision:	https://reviews.freebsd.org/D34780

Mk/Uses/pathfix.mk

@@ -52,6 +52,7 @@ pathfix:
 		s|[(]datadir[)]/pkgconfig|(prefix)/libdata/pkgconfig|g ; \
 		s|[{]datadir[}]/pkgconfig|(prefix)/libdata/pkgconfig|g ; \
 		s|[(]prefix[)]/lib/pkgconfig|(prefix)/libdata/pkgconfig|g ; \
+		s|[(]prefix[)]/share/pkgconfig|(prefix)/libdata/pkgconfig|g ; \
 		s|[[:<:]]lib/pkgconfig|libdata/pkgconfig|g; \
 		s|[(]libdir[)]/bonobo/servers|(prefix)/libdata/bonobo/servers|g'
 .endfor