[gtk+] tests: fix Makefile.am syntax

[Cosimo Cecchi <cosimoc src gnome org>]

commit 28e185dd1b8b5fcf90993e9d698110328c1d497d
Author: Cosimo Cecchi <cosimoc gnome org>
Date:   Sun Jan 3 11:33:19 2016 -0800

    tests: fix Makefile.am syntax
    
    It requires a tab character, or the build will fail.

 testsuite/css/style/Makefile.am |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/testsuite/css/style/Makefile.am b/testsuite/css/style/Makefile.am
index d7e7172..bbd72ef 100644
--- a/testsuite/css/style/Makefile.am
+++ b/testsuite/css/style/Makefile.am
@@ -45,7 +45,7 @@ substitutions = \
 test_files = $(test_in_files:.test.in=.test)
 
 $(test_files): %.test: %.test.in
-        $(AM_V_GEN) sed $(substitutions) $< > $  tmp && mv $  tmp $@
+       $(AM_V_GEN) sed $(substitutions) $< > $  tmp && mv $  tmp $@
 
 EXTRA_DIST += \
        reset-to-defaults.css   \