* -fno-devirtualize GCC 4.9.x ICE workaround.

* GCC builds itself 64-bit for some reason. Probably because I don't specify
  target and by default it is now 64-bit? I suspect that if I specify the
  x86_64-apple-darwin10 target, then it will default to 64-bit target?
  Probably will be switching to x86_64-apple-darwin10-only target in the
  next release.

* Using lipo to merge libstdc++ so that standard ODB "relative library path"
  mechanism works.