package/avahi: disable introspection

Fixes:
http://autobuild.buildroot.net/results/b9bf7cea8be9231552a10e8ea828bf24394402ba/

Building with introspection (together with D-Bus) support currently fails.
Fixing it is not trivial, so explicitly disable introspection for now.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Tested-by: Adam Duskett <aduskett@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit b4fcf2ff58e712b168fea549748ab2bb9ed7b88d)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/avahi/avahi.mk

@@ -81,6 +81,7 @@ AVAHI_CONF_OPTS = \
 	--disable-mono \
 	--disable-monodoc \
 	--disable-stack-protector \
+	--disable-introspection \
 	--with-distro=none \
 	--disable-manpages \
 	$(if $(BR2_PACKAGE_AVAHI_AUTOIPD),--enable,--disable)-autoipd \