We currently do support nasm and at least on OS/2 no other suitable
assembler is available.  Unfortunately at least up to version 2.08
it fails to handle some of our new AVX code.

This patch series implements one possible solution, namely adding
ifdefs around offending code sections.  It has been tested to work
on x86_32 and x86_64.

An alternative would be to use the configure check from the first
patch in the series and reject assemblers that cannot handle our
AVX code.  This would be cleaner, but less compatible with older
installed assemblers.

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