add gcc 4.2.1

toolchain/gcc/Config.in

toolchain/gcc/Config.version

toolchain/gcc/patches/4.2.1/100-uclibc-conf.patch

toolchain/gcc/patches/4.2.1/103-uclibc-conf-noupstream.patch

toolchain/gcc/patches/4.2.1/200-uclibc-locale.patch

toolchain/gcc/patches/4.2.1/203-uclibc-locale-no__x.patch

...chain/gcc/patches/4.2.1/204-uclibc-locale-wchar_fix.patch

toolchain/gcc/patches/4.2.1/205-uclibc-locale-update.patch

toolchain/gcc/patches/4.2.1/300-libstdc++-pic.patch

toolchain/gcc/patches/4.2.1/301-missing-execinfo_h.patch

toolchain/gcc/patches/4.2.1/302-c99-snprintf.patch

toolchain/gcc/patches/4.2.1/303-c99-complex-ugly-hack.patch

toolchain/gcc/patches/4.2.1/304-index_macro.patch

...chain/gcc/patches/4.2.1/305-libmudflap-susv3-legacy.patch

toolchain/gcc/patches/4.2.1/306-libstdc++-namespace.patch

...ain/gcc/patches/4.2.1/402-libbackend_dep_gcov-iov.h.patch

toolchain/gcc/patches/4.2.1/800-arm-bigendian.patch

toolchain/gcc/patches/4.2.1/904-flatten-switch-stmt-00.patch