package/libuhttpd: disable test plugin

test plugin needs dynamic library support

Fixes:
 - http://autobuild.buildroot.org/results/ce7c69ceac3390f6d22f777e4cf908188486c6b7

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/libuhttpd/libuhttpd.mk

@@ -10,6 +10,7 @@ LIBUHTTPD_LICENSE = MIT
 LIBUHTTPD_LICENSE_FILES = LICENSE
 LIBUHTTPD_INSTALL_STAGING = YES
 LIBUHTTPD_DEPENDENCIES = libev
+LIBUHTTPD_CONF_OPTS = -DBUILD_TEST_PLUGIN=OFF
 
 ifeq ($(BR2_PACKAGE_OPENSSL),y)
 LIBUHTTPD_DEPENDENCIES += openssl