Define TESTS variable

Signed-off-by: Tudor Florea <tudor.florea@enea.com>
Upstream-Status: Pending

diff -ruN a/Makefile.am b/Makefile.am
--- a/Makefile.am	2013-08-26 16:29:42.151429221 +0200
+++ b/Makefile.am	2013-08-26 17:52:31.013898120 +0200
@@ -43,7 +43,7 @@
 dist_usrbin_exec_SCRIPTS =
 systemdsystemunit_DATA =
 check_PROGRAMS =
-TESTS =
+TESTS = $(check_PROGRAMS)
 
 PATHFILES =