chacha/asm/chacha-x86.pl: improve [backward] portability.
In order to minimize dependency on assembler version a number of post-SSE2 instructions are encoded manually. But in order to simplify the procedure only register operands are considered. Non-register operands are passed down to assembler. Module in question uses pshufb with memory operands, and old [GNU] assembler can't handle it. Fortunately in this case it's possible skip just the problematic segment without skipping SSSE3 support altogether. Reviewed-by: Richard Levitte <levitte@openssl.org> Reviewed-by: Rich Salz <rsalz@openssl.org> (cherry picked from commit d89773d6)
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