[PATCH, libstdc++] Fix missing gthr-default.h issue on libstdc++ configure

[Pavel Chupin]

I can't configure libstdc++ separately. To reproduce:

mkdir BUILD
cd BUILD
../libstdc++-v3/configure

Error:
make: *** No rule to make target
`/users/pvchupin/android/toolchain/gcc/gcc-4.8/BUILD/../libgcc/gthr-default.h',
needed by `bits/gthr-default.h'.  Stop.

See fix attached.

Ok for trunk and 4.7?

2012-10-05  Pavel Chupin  <pavel.v.chupin@intel.com>

        Fix missing gthr-default.h issue on separate libstdc++ configure
        * libstdc++-v3/acinclude.m4: Define glibcxx_thread_h.
        * libstdc++-v3/include/Makefile.am: Use glibcxx_thread_h.
        * libstdc++-v3/Makefile.in: Regenerate.
        * libstdc++-v3/configure: Regenerate.
        * libstdc++-v3/doc/Makefile.in: Regenerate.
        * libstdc++-v3/include/Makefile.in: Regenerate.
        * 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.

-- 
Pavel Chupin
Intel Corporation
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