unix: fix mkerrors.sh on OpenBSD by using strlcpy #163
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On OpenBSD, strcpy causes an error message output that recommends the use of strlcpy[0]. Here, the result was that this output became part of the generated program code, causing gofmt to fail and create an empty zerrors_openbsd_GOARCH.go file.
An ifdef guard has been added within the C code which uses the desired strlcpy function under OpenBSD. Other operating systems continue to use strcpy.
[0] https://github.com/openbsd/src/blob/958bc3ae91838214c6d3bb7efc272663a5df7b01/lib/libc/string/strcpy.c#L34-L37