package/bind: force shared build

We got following error with --enable-static:

checking whether to build static libraries... yes
configure: error: Static linking is not supported as it disables dlopen() and certain security features (e.g. RELRO, ASLR)

Fixes:

 http://autobuild.buildroot.org/results/b55/b553898381ff0fdf5dd705fbb11b469b7564c6e6

Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
Signed-off-by: Julien Olivain <ju.o@free.fr>

package/bind/bind.mk

@@ -33,6 +33,7 @@ BIND_CONF_OPTS = \
 	--enable-epoll \
 	--disable-doh \
 	--disable-backtrace \
+	--disable-static \
 	--with-openssl=$(STAGING_DIR)/usr
 
 BIND_DEPENDENCIES = host-pkgconf libuv openssl