Correct a backport inconsistency in bind-9.11-rt46047.patch
    
    The patch seems to have been generated from a more recent bind
    tree in which `ns_g_lctx` was renamed `named_g_lctx`. So the
    patch uses the `named_g_lctx` name, but the rest of server.c
    in bind-9.11 still uses the name `ns_g_lctx`, so if you compile
    with --disable-crypto-rand, the build actually fails with an
    undeclared name error.