fixup gomp register/unregister prototypes

[Jakub Jelinek]

On Wed, Jul 15, 2015 at 03:04:30PM -0400, Nathan Sidwell wrote:
> I'm almost tempted to commit as obvious.  I noticed that the callers of
> these functions from code generated by mkoffload declare the 2nd arg as an
> int, because they have no visibility of the enum.  I thought it wise to make
> the definitions match.

I think it doesn't really matter that much, such an enum on all targets we care
about is passed the same way as int.

But if you think it is important, I don't really care either way.

> 2015-07-15  Nathan Sidwell  <nathan@codesourcery.com>
> 
> 	* target.c (GOMP_offload_register): Use int for device type arg.
> 	(GOMP_offload_unregister): Likewise.

	Jakub