oeqa/buildgalculator.py: Add dependency on gtk+3

This helps in skipping this test on images which are not using gtk and
as per the gcalculator website it needs gtk+3 or gtk+2 and libglade as
the build first looks for gtk+3

(From OE-Core rev: 2cdb4b3697e02947352803a9db013d61b812c4fd)

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oeqa/runtime/cases/buildgalculator.py

@@ -25,6 +25,7 @@ class GalculatorTest(OERuntimeTestCase):
     @OEHasPackage(['gcc'])
     @OEHasPackage(['make'])
     @OEHasPackage(['autoconf'])
+    @OEHasPackage(['gtk+3'])
     def test_galculator(self):
         self.project.download_archive()
         self.project.run_configure()