newlib 4.2.0 (built with -O2) and libstdc++ from GCC 12.2.0

Builds newlib with -O2 instead of -Os

newlib 4.2.0 and libstdc++ from GCC 12.2.0

Update for GCC 12 toolchain

newlib 3.3.0 and libstdc++ from GCC 9.2.0

newlib-3.3.0-gcc-9.2.0

Update versions to match GCC 9 toolchain

newlib 3.1.0.20181231 and libstdc++ from GCC 7.3.0

These are the same versions as in the initial stdlibs.zip