[patch, libfortran] Restore bootstrap on FreeBSD (hopefully)

[Thomas König]

As analyzed by Steve, on freebsd __gthread_t is a pointer type.
I thought it the cleanest solution to remove the #ifdef in gfc_unit,
make the "self" member a intptr_t and cast the return value of
__gthread_t to that type.

Sorry for breaking bootstrap... the ubiquity of Linux is really
striking here. There are a couple of

Regression-tested on Linux.  FreeBSD should also work, but I'd
like confirmation, if possible. Steve, could you be so kind?

OK for trunk?

Best regards

	Thomas

PR fortran/123512

libgfortran/ChangeLog:

	* io/io.h: Change type of self to intptr_t.
	* io/async.h (LOCK_UNIT): Cast __gthread_self () to intptr_t.
	(TRYLOCK_UNIT): Likewise.
	(OWN_THREAD_ID): Likewise.
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