Fixed build failure on Linux in cppfiles (_XOPEN_SOURCEis evil)

[Mark Mitchell]

>>>>> "Alexandre" == Alexandre Oliva <aoliva@redhat.com> writes:

    >> - Notice that we are using glibc, or particular versions of
    >> glibc, and turn on the defines there, since we know what they
    >> will do.

    Alexandre> But this is probably the way to go at this time.

I agree.  Andreas, please produce an appropriate patch.

Thanks!

--
Mark Mitchell                   mark@codesourcery.com
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