update Makefile: 'form' lib removed

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@56008 15284696-431f-4ddb-bdfa-cd5b030d7da7

Makefile

@@ -95,7 +95,6 @@ LIBDIRS = \
 	lib/gis \
 	lib/linkm \
 	lib/db \
-	lib/form \
 	lib/vector \
 	db/drivers