[gnome-calculator] configure.ac: don't use wildcards

[Niels De Graef <nielsdg src gnome org>]

commit a8a192dbea0a96783981d57ab515dc0145a1fb9f
Author: Niels De Graef <nielsdegraef gmail com>
Date:   Sat Jan 27 17:49:30 2018 +0100

    configure.ac: don't use wildcards
    
    This fixes `make distcheck`.

 Makefile.am |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index cb152a6..ad87b2b 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -3,8 +3,14 @@ SUBDIRS = data lib src search-provider tests help po
 AM_DISTCHECK_CONFIGURE_FLAGS = --enable-installed-tests
 
 EXTRA_DIST = \
-       **/meson.build \
        meson.build \
+       data/meson.build \
+       help/meson.build \
+       lib/meson.build \
+       po/meson.build \
+       search-provider/meson.build \
+       src/meson.build \
+       tests/meson.build \
        meson_post_install.py \
        $(NULL)