[gspell] build: update MAINTAINERCLEANFILES

[Sébastien Wilmet <swilmet src gnome org>]

commit b362ff5c581b8866aa89c2b68114fd9cb7225fdb
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Mon Aug 1 17:28:02 2016 +0200

    build: update MAINTAINERCLEANFILES

 Makefile.am |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index d515b4f..ef22f65 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -34,6 +34,7 @@ MAINTAINERCLEANFILES = \
        m4/ax_is_release.m4 \
        m4/ax_pkg_check_modules.m4 \
        m4/ax_require_defined.m4 \
+       m4/ax_valgrind_check.m4 \
        m4/codeset.m4 \
        m4/extern-inline.m4 \
        m4/fcntl-o.m4 \