mesa: Fix gallium build since 6991c2922f

Looks like I screwed up and didn't test gallium again after tweaking the
Makefile.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=57044

src/mesa/program/Makefile.am

@@ -35,7 +35,7 @@ DRICORE_LIB = libdricore_program.la
 endif
 
 noinst_LTLIBRARIES = $(DRICORE_LIB)
-if NEED_LIBMESA
+if HAVE_GALLIUM
 noinst_LTLIBRARIES += libprogram.la
 else
 check_LTLIBRARIES = libprogram.la