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Avoid multiple 'getcontext failed' warnings if getcontext is broken
(back-port of commits b594132, 2bfaff7 from 'master')

Issue #133 (bdwgc).

* mach_dep.c [!HAVE_PUSH_REGS && UNIX_LIKE && !NO_GETCONTEXT]
(GC_with_callee_saves_pushed): Define getcontext_works static variable;
do not call getcontext() if getcontext_works < 0; add comment; set
getcontext_works to 1 or -1 (depending whether getcontext is working)
if getcontext_works is zero.
* misc.c [THREADS && UNIX_LIKE && !NO_GETCONTEXT]
(callee_saves_pushed_dummy_fn): New static function (empty).
* misc.c [THREADS && UNIX_LIKE && !NO_GETCONTEXT] (GC_init): Call
GC_with_callee_saves_pushed(callee_saves_pushed_dummy_fn) if GC_dont_gc
or GC_dont_precollect (otherwise it is called by GC_gcollect_inner);
add comment.

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