gcc: add GCC 4.6.3

toolchain/gcc/Config.in

toolchain/gcc/Config.version

toolchain/gcc/common.mk

toolchain/gcc/patches/4.6.3/000-gcc-bug-54369.patch

toolchain/gcc/patches/4.6.3/002-siginfo_t.patch

toolchain/gcc/patches/4.6.3/100-uclibc-conf.patch

toolchain/gcc/patches/4.6.3/301-missing-execinfo_h.patch

toolchain/gcc/patches/4.6.3/302-c99-snprintf.patch

...chain/gcc/patches/4.6.3/305-libmudflap-susv3-legacy.patch

toolchain/gcc/patches/4.6.3/600-ubicom_support.patch

toolchain/gcc/patches/4.6.3/810-arm-softfloat-libgcc.patch

toolchain/gcc/patches/4.6.3/820-libgcc_pic.patch

toolchain/gcc/patches/4.6.3/830-arm_unbreak_armv4t.patch

...ain/gcc/patches/4.6.3/840-armv4_pass_fix-v4bx_to_ld.patch

toolchain/gcc/patches/4.6.3/910-mbsd_multi.patch

toolchain/gcc/patches/4.6.3/920-specs_nonfatal_getenv.patch

...cc/patches/4.6.3/993-arm_insn-opinit-RTX_CODE-fixup.patch

toolchain/gcc/patches/4.6.3/999-coldfire.patch