libretro: enableParalellBuilding, except for older MAMEs
libretro: enableParalellBuilding, except for older MAMEs

MAME since 0.225 have a fix for the build issues while building in
parallel. Since libretro.mame is on 0.227 right now, should be safe to
enable.

Since eventually enableParallelBuilding should be the default, enabling
it for all cores except the older MAMEs seems better than just enabling
for libretro.mame.

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