selftest: buildoptions: skip read-only-image test depending on distro

Poky-tiny cannot build core-image-sato, so skip test (read-only-image)
in this case.

(From OE-Core rev: bcee8c614f28b38054f5d8c1c5251b3702cf113c)

Signed-off-by: Leonardo Sandoval <leonardo.sandoval.gonzalez@linux.intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oeqa/selftest/buildoptions.py

@@ -43,6 +43,9 @@ class ImageOptionsTests(oeSelfTest):
 
     @testcase(1435)
     def test_read_only_image(self):
+        distro_features = get_bb_var('DISTRO_FEATURES')
+        if not ('x11' in distro_features and 'opengl' in distro_features):
+            self.skipTest('core-image-sato requires x11 and opengl in distro features')
         self.write_config('IMAGE_FEATURES += "read-only-rootfs"')
         bitbake("core-image-sato")
         # do_image will fail if there are any pending postinsts