Diffusion libgcrypt 5e9ba851948f

const-time: always avoid comparison operator for byte comparison
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const-time: always avoid comparison operator for byte comparison

* configure.ac: Remove POSSIBLE_CONDITIONAL_BRANCH_IN_BYTE_COMPARISON
macro.
* src/const-time.h (ct_not_equal_byte): Remove
POSSIBLE_CONDITIONAL_BRANCH_IN_BYTE_COMPARISON ifdef.

Cherry-pick master commit of:
137e35ad47ee8734d0f3ffb6af1d1669c4621e0b

Performance impact of avoiding comparison is negligible, so
remove the option for using comparison to make this easier
maintain (tested on every arch).