tests: move the SUBDIR at the top of the makefile

None of the subdirs require the modules built in the local makefile, so
moving them at the top makes things a hell lot easier to read.

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>

tests/Makefile.am

@@ -1,14 +1,3 @@
-AM_CFLAGS = \
-	$(WARN_CFLAGS)\
-	-I $(top_srcdir)/include/drm \
-	-I $(top_srcdir)
-
-LDADD = $(top_builddir)/libdrm.la
-
-check_PROGRAMS = \
-	dristat \
-	drmstat
-
 SUBDIRS = modeprint proptest
 
 if HAVE_LIBKMS
@@ -27,6 +16,21 @@ if HAVE_TEGRA
 SUBDIRS += tegra
 endif
 
+if HAVE_LIBUDEV
+SUBDIRS += vbltest
+endif
+
+AM_CFLAGS = \
+	$(WARN_CFLAGS)\
+	-I $(top_srcdir)/include/drm \
+	-I $(top_srcdir)
+
+LDADD = $(top_builddir)/libdrm.la
+
+check_PROGRAMS = \
+	dristat \
+	drmstat
+
 if HAVE_LIBUDEV
 
 check_LTLIBRARIES = libdrmtest.la
@@ -54,8 +58,6 @@ TESTS =						\
 	updatedraw				\
 	name_from_fd
 
-SUBDIRS += vbltest
-
 check_PROGRAMS += $(TESTS)
 
 endif