get_lib_path(): fix g.extension logic when libname is defined

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@67898 15284696-431f-4ddb-bdfa-cd5b030d7da7

lib/python/script/utils.py

@@ -289,8 +289,6 @@ def get_lib_path(modname, libname=None):
         if idx < 0:
             return None
         path = cwd[:idx+len(modname)] + sep + 'etc' + sep + modname
-        if libname:
-            path = join(path, libname)
     
     return path