Somewhere between Command Line Tools for Xcode 16.2 and 16.3, clang
started complaining like
<instantiation>:91:26: error: unexpected token in argument list
movk x7, br_low_b2, lsl 32
^
crc/aarch64/crc32_ieee_norm_pmull.S:34:1: note: while in macro instantiation
crc32_norm_func crc32_ieee_norm_pmull
It seems to do with some change to macro expansion; work around it by
replacing .equ directives with #defines.
Fixes#352
Signed-off-by: Tim Burke <tim.burke@gmail.com>
73c50447fc