Specify that SSE4.1 includes SSSE3 instead of SSE3.
Specify that SSE4.1 includes SSSE3 instead of SSE3.

According to LLVM source code: https://github.com/llvm/llvm-project/blob/544a6aa2674e3875e4014eafb101a982f9296439/llvm/lib/Target/X86/X86.td#L66-L82

rust-lang/reference,rust-lang/reference