zyre: disable docs

Fixes:
  http://autobuild.buildroot.net/results/c30/c307cfae46b800603b76f623840bd0fd950f0e3f/

Signed-off-by: Rahul Bedarkar <rahul.bedarkar@imgtec.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/zyre/zyre.mk

@@ -11,6 +11,7 @@ ZYRE_LICENSE_FILES = LICENSE
 ZYRE_INSTALL_STAGING = YES
 ZYRE_DEPENDENCIES = czmq zeromq host-pkgconf
 ZYRE_AUTORECONF = YES
+ZYRE_CONF_OPTS = --without-docs
 
 define ZYRE_CREATE_CONFIG_DIR
 	mkdir -p $(@D)/config