* config/gthr.m4: New. Define GCC_AC_THREAD_HEADER.
* libgcc/configure: Regenerate.
* libgcc/configure.ac: Replace code with GCC_AC_THREAD_HEADER use.
* libstdc++-v3/Makefile.in: Regenerate.
* libstdc++-v3/acinclude.m4: Replace code with GCC_AC_THREAD_HEADER use.
* libstdc++-v3/configure: Regenerate.
* libstdc++-v3/doc/Makefile.in: Regenerate.
* libstdc++-v3/include/Makefile.am: Regenerate.
* libstdc++-v3/include/Makefile.in: Rename variable.
* libstdc++-v3/libsupc++/Makefile.in: Regenerate.
* libstdc++-v3/po/Makefile.in: Regenerate.
* libstdc++-v3/python/Makefile.in: Regenerate.
* libstdc++-v3/src/Makefile.in: Regenerate.
* libstdc++-v3/src/c++11/Makefile.in: Regenerate.
* libstdc++-v3/src/c++98/Makefile.in: Regenerate.
* libstdc++-v3/testsuite/Makefile.in: Regenerate.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@192458
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