Fix __sync_fetch_and_nand_* for pre-v6 ARM #255
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gcc changed semantics for __sync_fetch_and_nand_* in gcc 4.4, and this was implementing the old semantics: https://gcc.gnu.org/onlinedocs/gcc-8.2.0/gcc/_005f_005fsync-Builtins.html
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gcc changed semantics for _sync_fetch_and_nand* in gcc 4.4,
and this was implementing the old semantics:
https://gcc.gnu.org/onlinedocs/gcc-8.2.0/gcc/_005f_005fsync-Builtins.html