travis: try re-enabling binary sanity check

On the ubuntu and mac jobs, try re-enabling the `--help` check, it
should now work thanks to @denisfa's work on a57e51f.

If this works we also want to use wine for the mingw jobs to do the
same.

Signed-off-by: Rafael Kitover <rkitover@gmail.com>

.travis.yml

@@ -18,7 +18,7 @@ matrix:
               - cd build
               - cmake ..
               - make -j2
-#              - xvfb-run ./visualboyadvance-m --help
+              - xvfb-run ./visualboyadvance-m --help
           cache:
               directories:
                   - "$HOME/.ccache"
@@ -73,7 +73,7 @@ matrix:
               - cd build
               - cmake ..
               - make -j2
-#              - ./visualboyadvance-m.app/Contents/MacOS/visualboyadvance-m --help
+              - ./visualboyadvance-m.app/Contents/MacOS/visualboyadvance-m --help
           cache:
               directories:
                   - "$HOME/.ccache"