build: Add tests directories to SUBDIRS

Fixes a problem with distcheck.

Makefile.am

@@ -26,12 +26,6 @@ ACLOCAL_AMFLAGS = -I m4
 doxygen:
 	cd doxygen && $(MAKE)
 
-check-local:
-	$(MAKE) -C src/mapi/glapi/tests check
-	$(MAKE) -C src/mapi/shared-glapi/tests check
-	$(MAKE) -C src/mesa/main/tests check
-	$(MAKE) -C src/glx/tests check
-
 .PHONY: doxygen
 
 # Rules for making release tarballs

src/mapi/glapi/Makefile.am

@@ -19,6 +19,8 @@
 # FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 # IN THE SOFTWARE.
 
+SUBDIRS = . tests
+
 TOP = $(top_srcdir)
 include Makefile.sources
 include ../Makefile.sources

src/mapi/shared-glapi/Makefile.am

@@ -1,5 +1,7 @@
 # Used by OpenGL ES or when --enable-shared-glapi is specified
 
+SUBDIRS = . tests
+
 TOP = $(top_srcdir)
 GLAPI = $(top_srcdir)/src/mapi/glapi
 include $(top_srcdir)/src/mapi/Makefile.sources

src/mesa/Makefile.am

@@ -23,7 +23,7 @@ if NEED_LIBDRICORE
 DRICORE_SUBDIR = libdricore
 endif
 
-SUBDIRS = program x86 x86-64 . $(DRICORE_SUBDIR)
+SUBDIRS = program x86 x86-64 . $(DRICORE_SUBDIR) main/tests
 
 if HAVE_X11_DRIVER
 SUBDIRS += drivers/x11