.gitignore: re-add Makefile.local

Commit db6cb693 mistakenly removed Makefile.local from .gitignore.
Restore it back. See commit 43fb9484 for more info.

Cc: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Kir Kolyshkin <kir@openvz.org>
Acked-by: Cyrill Gorcunov <gorcunov@openvz.org>
Acked-by: Andrew Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

.gitignore

@@ -14,6 +14,7 @@
 cscope*
 tags
 TAGS
+Makefile.local
 images/*.c
 images/*.h
 images/google/protobuf/*.c