mjg fa60d0fc51 vfs: provide F_ISUNIONSTACK as a kludge for libc
Prior to introduction of this op libc's readdir would call fstatfs(2), in
effect unnecessarily copying kilobytes of data just to check fs name and a
mount flag.

Reviewed by:	kib (previous version)
Differential Revision:	https://reviews.freebsd.org/D23162
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