MPIR fails to build when CPU's architecture name doesn't match its actual capabilities

Imported from <a href="http://trac.sagemath.org/sage_trac/ticket/12970">trac #12970</a>.

Diff between the 2.4.0.p4 and 2.4.0.p5 spkgs. For reference / review only.

Reported by: kini

Component: packages

CC: was,, jdemeyer,, leif

Report Upstream: N/A

Authors: Jeroen Demeyer

Dependencies: <a href="http://trac.sagemath.org/sage_trac/ticket/12954">trac #12954</a>

Work issues: 

Reviewers: Volker Braun, William Stein

Merged in: sage-5.0.1.rc0

Attachments: <ol><li><a href="http://trac.sagemath.org/sage_trac/attachment/ticket/12970/configure.patch">configure.patch: Patch for configure.in and related files inside the spkg, for review only</a> by jdemeyer at 20120528T05:42:24</li><li><a href="http://trac.sagemath.org/sage_trac/attachment/ticket/12970/mpir-2.4.0.p5.diff">mpir-2.4.0.p5.diff: Diff between the 2.4.0.p4 and 2.4.0.p5 spkgs. For reference / review only.</a> by jdemeyer at 20120528T05:56:50</li></ol>