cmount: fix Windows compile (thanks Bill Zissimopoulos)

cmd/cmount/mount_unix.go

@@ -0,0 +1,15 @@
+// +build cgo
+// +build linux darwin freebsd
+
+package cmount
+
+import "golang.org/x/sys/unix"
+
+func init() {
+	umask = unix.Umask(0) // read the umask
+	unix.Umask(umask)     // set it back to what it was
+	uid = uint32(unix.Geteuid())
+	gid = uint32(unix.Getegid())
+	commandDefintion.Flags().Uint32VarP(&uid, "uid", "", uid, "Override the uid field set by the filesystem.")
+	commandDefintion.Flags().Uint32VarP(&gid, "gid", "", gid, "Override the gid field set by the filesystem.")
+}