[RFT] Caches on ARMv7

[Vladimir 'φ-coder/phcoder' Serbinenko]

Hello, all. I've changed in arm branch to detect cache type on runtime
rather than compile time. Now a version compiled for armv6 should work
on armv7 as well thus avoiding the need of two separate binaries. As an
additional bonus it doesn't #error anymore when compiled with default
gcc target (which is armv4t). Please test on armv7 when compiling for
armv4t, armv6 and armv7.

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