gitignore: Ignore the examples/cogl-gles2-gears executable
gitignore: Ignore the examples/cogl-gles2-gears executable

https://bugzilla.gnome.org/show_bug.cgi?id=697330

Reviewed-by: Robert Bragg <12e9293ec6b30c7fa8a0926af42807e929c1684f@linux.intel.com>
Reviewed-by: Neil Roberts <822ec91a7ef82248fd36162ca8ac3283eba70848@linux.intel.com>

djdeath/cogl,gcampax/cogl,djdeath/cogl,gcampax/cogl,gcampax/cogl,djdeath/cogl,gcampax/cogl