add easyconfig GCC-4.9.4-2.25.eb, add easyconfig GCCcore-4.9.4.eb, add...

add easyconfig GCC-4.9.4-2.25.eb, add easyconfig GCCcore-4.9.4.eb, add easyconfig M4-1.4.17-GCCcore-4.9.4.eb, add easyconfig binutils-2.25-GCCcore-4.9.4.eb, add easyconfig flex-2.6.0-GCCcore-4.9.4.eb, add easyconfig zlib-1.2.8-GCCcore-4.9.4.eb, add easyconfig Bison-3.0.4-GCCcore-4.9.4.eb