target/6383: boehm-gc busted on all sparc64 targets

[David S. Miller]

   From: Jeff Sturm <jsturm@one-point.com>
   Date: Mon, 22 Apr 2002 00:41:33 -0400 (EDT)
   
   Doh... DYNAMIC_LOADING isn't defined for sparc64-solaris.  There's part
   of your problem.  With the patch below I can run gctest.  I'll try some
   Java code once the build finishes.
   
   (This must've gotten reverted at the last gc import, I'm fairly certain
   it used to work.)

If people don't mind I'm going to check in Jeff's fix for Solaris
and a fix I have for the sparc64-linux-gnu boehm-gc failures so
we can close this bug.

Thanks for tracking this down and testing your fix Jeff.  I suspected
that lack of DYNAMIC_LOADING for solaris sparc64 was bogus and I
had noted it to tromey the other evening.