Make error on gmp 4.2

[Torbjorn Granlund]

"Sharma, Rahul" <rahul.sharma at hp.com> writes:

  I am facing following error while installing gmp 4.2.
  
  D64 +O2 -c diveby3.c  +Z -DPIC -o .libs/diveby3.o
  cc: "diveby3.c", line 50: error 1671: Illegal use of restrict.
  cc: "diveby3.c", line 50: error 1671: Illegal use of restrict.

That is a bug in the parser of HP's compiler.

-- 
Torbjörn