Refine TARGET_GLOBAL_CFLAGS for x86 and x86_64:

       Remove -msse2 for x86 (-mssse3 should be provided by the compiler).
       Remove -fPIC (compiler provides by default).
       Remove -fno-inline-functions-called-once.

Change-Id: Ibb29934224c4eedfff926dc72c3b6342c1861ac9