[gnome-calculator] Ensure libtool files are ignored and cleanable

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 5d9457c378e10fbfda7536bb8ff6ad75bc0c869a
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Sun Apr 6 09:34:41 2014 -0500

    Ensure libtool files are ignored and cleanable
    
    We are now using libtool for installed tests.

 Makefile.am |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index 4bd7ade..582f28d 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -7,7 +7,8 @@ DISTCLEANFILES = test-driver
 
 MAINTAINERCLEANFILES = \
        $(GITIGNORE_MAINTAINERCLEANFILES_TOPLEVEL) \
-       $(GITIGNORE_MAINTAINERCLEANFILES_MAKEFILE_IN)
+       $(GITIGNORE_MAINTAINERCLEANFILES_MAKEFILE_IN) \
+       $(GITIGNORE_MAINTAINERCLEANFILES_M4_LIBTOOL)
 
 EXTRA_DIST = \
        autogen.sh \