Use --without-docs if libzmq isn't v4.1.6

* To silent deprecation warning.

Author: n-riesco

scripts/build_libzmq.sh

@@ -25,7 +25,7 @@ test -f configure || ./autogen.sh
 if [ "$ZMQ" = "4.1.6" ]; then
   ./configure "--prefix=${ZMQ_PREFIX}" --with-relaxed --enable-static --disable-shared --without-documentation ;
 else
-  ./configure "--prefix=${ZMQ_PREFIX}" --disable-pedantic --enable-static --disable-shared --without-documentation ;
+  ./configure "--prefix=${ZMQ_PREFIX}" --disable-pedantic --enable-static --disable-shared --without-docs ;
 fi
 make -j 2
 make install