alphasort() uses strcoll() in some libcs (notably glibc and musl) which
makes it locale-sensitive.
Replace it with a simple strcmp-based lexicographic comparison for
consistent behavior across platforms.
Remove the special-casing for OpenBSD. It has been exporting function
prototypes conforming to POSIX.1-2008 since OpenBSD 5.3 and that was
released more than three years ago.
OS X 10.7 is now the only special case left.
Fixes: https://github.com/libuv/libuv/issues/1045
PR-URL: https://github.com/libuv/libuv/pull/1046
Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>
Reviewed-By: Saúl Ibarra Corretgé <saghul@gmail.com>
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