tests/Android.mk : skip kms_legacy_colorkey if no cairo

test kms_legacy_colorkey depends on cairo, so add it to
the list of test not to build unless "ANDROID_HAS_CAIRO"
is set.
Signed-off-by: Tim Gore <tim.gore@intel.com>
Signed-off-by: Thomas Wood <thomas.wood@intel.com>

tests/Android.mk

@@ -79,7 +79,8 @@ else
     kms_plane_scaling \
     kms_panel_fitting \
     kms_pwrite_crc \
-    kms_pipe_b_c_ivb
+    kms_pipe_b_c_ivb \
+    kms_legacy_colorkey
     IGT_LOCAL_CFLAGS += -DANDROID_HAS_CAIRO=0
 endif