add gcc 4.5.2 (replaces 4.5.1)

toolchain/gcc/common.mk

toolchain/gcc/patches/4.5.2/002-fix_pr44392.patch

toolchain/gcc/patches/4.5.2/100-uclibc-conf.patch

toolchain/gcc/patches/4.5.2/301-missing-execinfo_h.patch

toolchain/gcc/patches/4.5.2/302-c99-snprintf.patch

...chain/gcc/patches/4.5.2/305-libmudflap-susv3-legacy.patch

toolchain/gcc/patches/4.5.2/600-ubicom_support.patch

toolchain/gcc/patches/4.5.2/810-arm-softfloat-libgcc.patch

toolchain/gcc/patches/4.5.2/820-libgcc_pic.patch

toolchain/gcc/patches/4.5.2/910-mbsd_multi.patch

...cc/patches/4.5.2/993-arm_insn-opinit-RTX_CODE-fixup.patch

toolchain/gcc/patches/4.5.2/999-coldfire.patch