Commit 786b649331f06687f70ae290227a84663f2a2ca6

DRC 2016-12-05T12:39:49

Reorg AltiVec detection code + advertise that full AltiVec SIMD acceleration is now available on OpenBSD. The relevant compilers probably all support C99 or GNU's variation of C90 that allows variables to be declared anywhere, but our policy is to conform to the C90 standard, if for no other reason than that it improves code readability.