osx: Removed some optimizations for x86 builds as they were causing seg faults.

When using gcc compiler (as opposed to llvm) to build 32 bit tcc, compiler flags
-mpreferred-stack-boundary=2, -march=i386 and -falign-functions=2 were being
used. -march is redundant as -m32 is already being used. The other two seem to
be corrupting stack. I am not sure why this is the case, as the explanation of
the flags states that only running code size should be affected, but it does.

I think that is is safe to remove these flags altogether for all compilers and
platforms, especially since they are not being used for 64 bit builds. However
I do not want to apply such wide change without agreement from the people on the
mailing list.

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