include: stop generating platform_defs.h

include: stop generating platform_defs.h

Now that the sizeof checks are gone, we can stop generating platform_defs.h.
The only caveat is that we need to stop undefining ENABLE_GETTEXT, which the
generation process had removed before.  The actual ENABLE_GETTEXT will be
passd on the compiler command line, just like other ENABLE or HAVE values
from autoconf.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
Signed-off-by: Carlos Maiolino <cem@kernel.org>