Log message:
Pullup ticket #2728 - requested by dsainty
libproxy: fix build of dependent packages

Revisions pulled up:
- www/libproxy/buildlink3.mk		1.3
---
Module Name:	pkgsrc
Committed By:	dsainty
Date:		Tue Apr  7 03:14:07 UTC 2009

Modified Files:
	pkgsrc/www/libproxy: buildlink3.mk

Log message:
Pull in lang/python/extension.mk when buildlinking.

Specifically, this fixes the build of dependent packages (like net/libsoup24)
under Linux, which attempt (and fail) to link in -ldb4 as requested by
${PREFIX}/lib/libproxy.la.