Merge pull request matplotlib#2623 from efiring/include_order

setupext: put pkg-config -I, -L, -l locations at the head of the list

Author: efiring

setupext.py

@@ -289,7 +289,7 @@ def setup_extension(self, ext, package, default_include_dirs=[],
                 for token in output.split():
                     attr = flag_map.get(token[:2])
                     if attr is not None:
-                        getattr(ext, attr).append(token[2:])
+                        getattr(ext, attr).insert(0, token[2:])
 
         if use_defaults:
             basedirs = get_base_dirs()