[arch-dev-public] New package - libmpc

[Allan McRae]

Hi,

MPC (http://www.multiprecision.org/) is the complex number version of 
MPFR and will be required in the future for gcc-4.5.  While that is 
still a while off, I want to add this to [testing] in the mean time to 
allow easier testing of future gcc builds.  Given the clash of names 
with the other mpc, I have been naming this libmpc as has been the 
strategy in Debian.

Allan