[ARM] Adjust strcmp-armv7.S selection logic.

[Marcus Shawcroft]

Reformulate the strcmp-armv7.S selection logic around the architecture
features required by the implementation code rather (some) version of
the architecture that expose those features.


OK ?

/Marcus

       * libc/machine/arm/strlen-stub.c: Adjust strlen-armv7.S selection 
logic.
         * libc/machine/arm/strlen.S: Likewise.
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