Remove GST_MAJORMINOR and replace it by GST_API_VERSION
Also set GST_VERSION_{MAJOR,MINOR,MICRO,NANO} explicitely
now.
All versions are at 1.0.0 now for the release soon but
API/ABI can still change until the 1.0.0 release.
Next release versions until 1.0.0 will be 0.10.9X and
these will be release candidates. GST_VERSION_* will
nonetheless stay at 1.0.0.0.
So that the -base libs can figure out the right include paths for the
gobject-introspection tools even if core got installed into a prefix
that's not the same prefix as gobject-introspection is installed in
or it's being build in an uninstalled gstreamer setup.
