[ros-diffs] [cfinck] 45254: - Updated toolchain versions again (GCC 4.4.3, GMP 4.3.2, MinGW-Runtime 3.17, w32api 3.14). - Use -march=native if supported for compiling the RosBE-Unix toolchain. - Use --disable-werror for all toolchain components to be prepared for future unknown warnings. - Use the safer and recommended -O2 optimization level instead of the more aggressive and buggy -O3. - Denote our versions of GCC using --with-pkgversion. - Remove some wrong or redundant build flags. - Properly unset varia