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This patch cleans up the auto configury mechanism used to select different implementations of memcpy for various architecture versions. The approach here is to remove the selection of memcpy within automake and instead use complimentary logic in memcpy-stub.c and memcpy.S to choose between the generic memcpy.c implemenation or one of the architecture specific memcpy*.S implemenations. Regressed for armv7-a armv5 armv8-a, correct selection of memcpy implementation by manual inspection of a test program built for these three architectures. This revised patch flips the remaining preprocessor logic in memcpy-stub.c to use ACLE defines as requested in the previous review and removes the now disused HAVE_ARMV7A and HAVE_ARMV8A configure.in support.