nfs-kernel-server: Fix compile with uClibc-ng

NS_MAXMSG is not defined.

Signed-off-by: Rosen Penev <rosenp@gmail.com>
(cherry picked from commit 732b1c4c0e)

net/nfs-kernel-server/patches/102-uclibc-ns-maxmsg.patch

@@ -0,0 +1,13 @@
+--- a/support/nfsidmap/libnfsidmap.c
++++ b/support/nfsidmap/libnfsidmap.c
+@@ -89,6 +89,10 @@ gid_t nobody_gid = (gid_t)-1;
+ #define NFS4DNSTXTREC "_nfsv4idmapdomain"
+ #endif
+ 
++#ifndef NS_MAXMSG
++#define NS_MAXMSG 65535
++#endif
++
+ /* Default logging fuction */
+ static void default_logger(const char *fmt, ...)
+ {