tests: use 'check_PROGRAMS' instead of 'noinst_PROGRAMS'

When using 'check_PROGRAMS', autoconf/automake generates smarter
Makefiles, so that the test programs are not being compiled during
the normal 'make all', but only during 'make check'.

Change-Id: I13b519e61ca0d9ce038e8c989ddac012de4a6c61
diff --git a/tests/msc_vlr/Makefile.am b/tests/msc_vlr/Makefile.am
index 0e15036..a84ea3f 100644
--- a/tests/msc_vlr/Makefile.am
+++ b/tests/msc_vlr/Makefile.am
@@ -76,7 +76,7 @@
 	msc_vlr_test_ss.err \
 	$(NULL)
 
-noinst_PROGRAMS = \
+check_PROGRAMS = \
 	msc_vlr_test_no_authen \
 	msc_vlr_test_gsm_authen \
 	msc_vlr_test_gsm_ciph \