[Bug 50985] ns_name_skip is glibc specific, causes failure to build on musl

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=50985

--- Comment #1 from Hans Leidekker  ---
(In reply to Andrew Benson from comment #0)
> 6.6 introduced a reliance on glibc-specific calls in dlls/dnsapi/libresolv.c
> in commit 5f44c46164a5c0c50fffdf6cda9980a74079e1ac.

It's not glibc specific. macOS and Android also have this export.
> Specifically, musl does not implement ns_name_skip, and the library fails at
> link time.

musl does export ns_initparse, ns_parserr and ns_name_uncompress. It would be
nice if ns_name_skip could be added. Alternatively we could reimplement the
function.