ubox: fix logging support. the initial connect failed

Signed-off-by: John Crispin <blogic@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@39024 3c298f89-4303-0410-b956-a3cf2f4a3e73
libevent2: Configure with --disable-debug-mode

Saves around 10K.

Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@39025 3c298f89-4303-0410-b956-a3cf2f4a3e73