nx-xtrans.m4: reintroduce HAS_STICKY_DIR_BIT

Fixes ArcticaProject#781

Author: uli42

m4/nx-xtrans.m4

@@ -166,3 +166,14 @@ AC_DEFUN([NX_XTRANS_SECURE_RPC_FLAGS],
  fi
  AC_MSG_RESULT($SECURE_RPC)
 ]) # NX_XTRANS_SECURE_RPC_FLAGS
+
+# the following originates from libxtrans/configure.ac
+
+# sticky bit
+#
+# if any system exists without sticky dir bits this
+# needs to be redone with a real autoconf test
+
+sticky_bit_define="-DHAS_STICKY_DIR_BIT"
+
+AC_SUBST(sticky_bit_define)