[mutter] build: Fix distcheck

[Florian Müllner <fmuellner src gnome org>]

commit 951fb03a7c09b7ec5526dc7b6fe1b7c4af704a2f
Author: Florian Müllner <fmuellner gnome org>
Date:   Mon Jul 9 16:09:25 2018 +0200

    build: Fix distcheck
    
    The test fix in commit 859bea629b52 broke distcheck, probably because
    abs_srcdir is prefixed with a relative $BUILDROOT. Hopefully this is
    the last autotools breakage before switching to meson, so don't
    bother investigating too much ...

 src/Makefile-tests.am | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)
---
diff --git a/src/Makefile-tests.am b/src/Makefile-tests.am
index 1ad5ad5e8..82778b2f5 100644
--- a/src/Makefile-tests.am
+++ b/src/Makefile-tests.am
@@ -12,12 +12,12 @@ test_programs = \
 if BUILDOPT_INSTALL_TESTS
 stackingdir = $(pkgdatadir)/tests/stacking
 dist_stacking_DATA =                                           \
-       $(abs_srcdir)/tests/stacking/basic-x11.metatest         \
-       $(abs_srcdir)/tests/stacking/basic-wayland.metatest     \
-       $(abs_srcdir)/tests/stacking/minimized.metatest         \
-       $(abs_srcdir)/tests/stacking/mixed-windows.metatest     \
-       $(abs_srcdir)/tests/stacking/set-parent.metatest        \
-       $(abs_srcdir)/tests/stacking/override-redirect.metatest
+       $(srcdir)/tests/stacking/basic-x11.metatest     \
+       $(srcdir)/tests/stacking/basic-wayland.metatest \
+       $(srcdir)/tests/stacking/minimized.metatest     \
+       $(srcdir)/tests/stacking/mixed-windows.metatest     \
+       $(srcdir)/tests/stacking/set-parent.metatest    \
+       $(srcdir)/tests/stacking/override-redirect.metatest
 
 mutter-all.test: tests/mutter-all.test.in
        $(AM_V_GEN) sed  -e "s|@libexecdir[@]|$(libexecdir)|g"  $< > $@.tmp && mv $@.tmp $@