add support for gcc-4.5.1

toolchain/gcc/Config.in

toolchain/gcc/Config.version

toolchain/gcc/common.mk

toolchain/gcc/patches/4.5.1/100-uclibc-conf.patch

toolchain/gcc/patches/4.5.1/301-missing-execinfo_h.patch

toolchain/gcc/patches/4.5.1/302-c99-snprintf.patch

...chain/gcc/patches/4.5.1/305-libmudflap-susv3-legacy.patch

toolchain/gcc/patches/4.5.1/600-ubicom_support.patch

toolchain/gcc/patches/4.5.1/810-arm-softfloat-libgcc.patch

toolchain/gcc/patches/4.5.1/820-libgcc_pic.patch

toolchain/gcc/patches/4.5.1/910-mbsd_multi.patch

...cc/patches/4.5.1/993-arm_insn-opinit-RTX_CODE-fixup.patch

toolchain/gcc/patches/4.5.1/999-coldfire.patch