testcc.sh: allow $CC to contain multiple words

Imported from <a href="http://trac.sagemath.org/sage_trac/ticket/12821">trac #12821</a>.



Reported by: jdemeyer

Component: build

CC: 

Report Upstream: N/A

Authors: Jeroen Demeyer

Dependencies: 

Work issues: 

Reviewers: Leif Leonhardy, R. Andrew Ohana

Merged in: sage-5.1.beta2

Attachments: <ol><li><a href="http://trac.sagemath.org/sage_trac/attachment/ticket/12821/libm4rie-20111004.p3.diff">libm4rie-20111004.p3.diff: </a> by jdemeyer at 20120410T08:47:05</li><li><a href="http://trac.sagemath.org/sage_trac/attachment/ticket/12821/12821_testcc.patch">12821_testcc.patch: </a> by jdemeyer at 20120525T05:04:41</li></ol>