tests: disable all tests when --disable-tests is used

Move conditional subdir include into top level.

Based on patch by: Joel Holdsworth

https://bugzilla.gnome.org/show_bug.cgi?id=757703

Makefile.am

@@ -6,13 +6,19 @@ else
 SUBDIRS_EXAMPLES =
 endif
 
+if BUILD_TESTS
+SUBDIRS_TESTS = tests
+else
+SUBDIRS_TESTS =
+endif
+
 SUBDIRS = \
 	gst \
 	common \
 	pkgconfig \
 	docs \
 	$(SUBDIRS_EXAMPLES) \
-	tests
+	$(SUBDIRS_TESTS)
 
 DIST_SUBDIRS = gst common pkgconfig docs examples tests
 

tests/Makefile.am

@@ -6,14 +6,6 @@ AM_LDFLAGS = \
 	$(GST_LIBS) \
 	$(top_builddir)/gst/rtsp-server/libgstrtspserver-@GST_API_VERSION@.la
 
-if BUILD_TESTS
-SUBDIRS_CHECK = check
-else
-SUBDIRS_CHECK =
-endif
+SUBDIRS = check
 
-SUBDIRS = 			\
-	$(SUBDIRS_CHECK)
-
-DIST_SUBDIRS = 			\
-	check
+DIST_SUBDIRS = check