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Make BMI2 inline assembly check more robust

Description

Make BMI2 inline assembly check more robust

* configure.ac (gcry_cv_gcc_inline_asm_bmi2): New assembly test.

Use actual assembly snippets from keccak.c to check that compiler
has proper support for used BMI2 instructions.

  • GnuPG-bug-id: T3408
  • Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>

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