[1.7 ITP] mpc-0.6

[David Billinghurst]

The MPC complex math library http://www.multiprecision.org/mpc is the 
complex number analog of the MPFR library.  MPC will be probably be a 
prerequisite for gcc-4.5. See:
  - http://gcc.gnu.org/ml/gcc-patches/2009-03/msg00671.html
  - http://gcc.gnu.org/ml/gcc-patches/2009-03/msg00804.html

As the GMP and MPFR maintainer, I'd like to provide mpc-0.6 for 
cygwin-1.7.  It builds OOTB with gcc-4.  I don't think mpc is (yet) 
provided by many linux distributions, so we need a vote.

I have a working mpc package, but I will rebuild/retest after I have 
updated to gmp-4.3.0.

	David