add gcc-4.5.0 preliminary support

toolchain/gcc/Config.in

toolchain/gcc/Config.version

toolchain/gcc/Makefile

toolchain/gcc/patches/4.5.0/100-uclibc-conf.patch

toolchain/gcc/patches/4.5.0/301-missing-execinfo_h.patch

toolchain/gcc/patches/4.5.0/302-c99-snprintf.patch

...chain/gcc/patches/4.5.0/305-libmudflap-susv3-legacy.patch

toolchain/gcc/patches/4.5.0/600-ubicom_support.patch

toolchain/gcc/patches/4.5.0/810-arm-softfloat-libgcc.patch

toolchain/gcc/patches/4.5.0/820-libgcc_pic.patch

toolchain/gcc/patches/4.5.0/910-mbsd_multi.patch

...cc/patches/4.5.0/993-arm_insn-opinit-RTX_CODE-fixup.patch

toolchain/gcc/patches/4.5.0/999-coldfire.patch

tools/Makefile

tools/mpc/Makefile

tools/mpfr/Makefile

tools/mpfr/patches/001-no_tests.patch