[PATCH, GCC] Fix conflicting posix_memalign declaration error

[Caroline Tice]

The posix_memalign declaration in gcc/i386/config/pmm_malloc.h is
decorated with 'throw ()', which occasionally causes declaration
conflict errors (some header files, not part of GCC, that declare
posix_memalign, do not have the throw decoration).  An example of this
can be seen at https://github.com/android-ndk/ndk/issues/91.  It
appears that the 'throw()' decoration comes from glibc header files.
Adding ifdefs to check for __GLIBC__ before adding the 'throw()' fixed
the github problem mentioned above.

I have tested this patch by bootstrapping and by running test
testsuite with no regressions.

Is this ok to commit?

-- Caroline Tice
ctice42@gmail.com


gcc/ChangeLog:

2016-10-27  Caroline Tice  <cmtice@google.com>

        * config/i386/pmm_malloc.h (posix_memalign):  Add ifdefs to only
        decorate the declaration with 'throw()' if __GLIBC__ is defined.
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