Various arm64 and bootstrap-on-FreeBSD fixes #427
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Apparently clang 18 has become more strict about using floating point registers in inline assembly when -mgeneral-regs-only is used. This causes sys/arm64/arm64/vfp.c to fail to compile, with "error: instruction requires: fp-armv8", and "error: expected readable system register". To fix it, similar to other files compiled for arm64, disable -mgeneral-regs-only for this particular file. PR: 276104 MFC after: 1 month (cherry picked from commit f4d93b6)
* neon is apparently broken (it's disabled even in upstream ports) * dunno if `-DPIXMAN_TIMERS` is important, but had to turn it off
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