Various constants and strings identifying the authors are currently
misplaced in .text. This change allows using execute-only .text on
platforms that enforce it by default, such as OpenBSD.
Modify x86_64-xlate.pl to replace .rodata with __DATA,__const for macs.
Adapt the nasm/masm path to emit an .rdata segment with alignment of 8.
This last change is not strictly needed but makes things explicit.
Change-Id: If716b892c1faabd85c6c70bdd75e145304841f83
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/57445
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
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