Upgrade mpc and make it a standard package

Imported from <a href="http://trac.sagemath.org/sage_trac/ticket/12515">trac #12515</a>.

Diff for mpc-1.0.0dev1126.p1.spkg, for review only

Reported by: jdemeyer

Component: packages

CC: jpflori,, leif

Report Upstream: Fixed upstream, but not in a stable release.

Authors: Jeroen Demeyer

Dependencies: <a href="http://trac.sagemath.org/sage_trac/ticket/10492">trac #10492</a>, <a href="http://trac.sagemath.org/sage_trac/ticket/12223">trac #12223</a>

Work issues: 

Reviewers: Jean-Pierre Flori, Volker Braun

Merged in: sage-5.0.beta13

Attachments: <ol><li><a href="http://trac.sagemath.org/sage_trac/attachment/ticket/12515/12515_mpc_sage_root.patch">12515_mpc_sage_root.patch: </a> by jdemeyer at 20120216T09:34:47</li><li><a href="http://trac.sagemath.org/sage_trac/attachment/ticket/12515/12515_mpc_standard.patch">12515_mpc_standard.patch: </a> by jdemeyer at 20120216T09:37:22</li><li><a href="http://trac.sagemath.org/sage_trac/attachment/ticket/12515/12515_norm.patch">12515_norm.patch: </a> by jdemeyer at 20120220T12:37:55</li><li><a href="http://trac.sagemath.org/sage_trac/attachment/ticket/12515/mpc-1.0.0dev1126.diff">mpc-1.0.0dev1126.diff: Diff for the mpc spkg (w.r.t. the latest optional mpc spkg), for review only</a> by jdemeyer at 20120224T14:57:01</li><li><a href="http://trac.sagemath.org/sage_trac/attachment/ticket/12515/mpc-1.0.0dev1126.p1.diff">mpc-1.0.0dev1126.p1.diff: Diff for mpc-1.0.0dev1126.p1.spkg, for review only</a> by jdemeyer at 20120323T12:16:01</li></ol>