[patch, 4.9] backport parallel header changes to the 4.9 branch

[Matthias Klose]

Backport these header changes to the 4.9 branch. No regression, but reported to 
the Debian BTS.  Safe to backport according to Jonathan Wakely. No regressions 
in the testsuite on x86_64-linux-gnu. Ok for the branch?

libstdc++-v3/

2014-12-02  Matthias Klose  <doko@ubuntu.com>

         PR libstdc++/64103
         Backport from mainline
         2014-11-03  Paolo Carlini  <paolo.carlini@oracle.com>

         * include/parallel/algo.h: Do not use default arguments in function
         template redeclarations (definitions).
         * include/parallel/numeric.h: Likewise.

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