gmp-5.0.0 fails to build on x86_64-apple-darwin10

[Jack Howarth]

   It was suggested on the darwin-dev mailing list...

http://lists.apple.com/archives/Darwin-dev/2010/Jan/msg00024.html

that the linkage failure on x86_64-apple-darwin10 could be worked around
by changing...

Lstrip_x:
	mov     Ltable at GOTPCREL(%rip), %r9

in the generated tmp-gcd_1.s to...

Lstrip_x:
	lea    Ltable(%rip), %r9

This change allows the linkage of libgmp.3.dylib to succeed and
the resulting gmp 5.0 build passes all of make check. I'm not sure
how achieve this change via mpn/gcd_1.asm though. In anycase, this
appears to be a potential workaround.
          Jack