libupnp: adjust two options

In pupnp master, these are disabled and enabled by default.

They fix Gerbera usage. CMake warnings:

!! It is strongly recommended to build libupnp with --disable-blocking-tcp-connections !! Without this option non-responsive control points can cause libupnp to hang.]=])

!! It is strongly recommended to build libupnp with --enable-reuseaddr !! Without this option Gerbera will be unable to restart with the same port number.]=])

Signed-off-by: Rosen Penev rosenp@gmail.com