Revert "bind: fix compilation when lmdb.h is present on host"

This reverts commit 7c0ecd4d7526dedce85a49172b031f45cde19a4b, as it is
in fact a duplicate of commit
bb95fef1e0bec4ebc0584001f337438b17c4744d.

Reported-by: Peter Seiderer <ps.report@gmx.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/bind/bind.mk

@@ -30,7 +30,6 @@ BIND_CONF_OPTS = \
 	--enable-epoll \
 	--with-libtool \
 	--with-gssapi=no \
-	--with-lmdb=no \
 	--enable-filter-aaaa
 
 ifeq ($(BR2_PACKAGE_ZLIB),y)