Revert "net/miniupnpd: ext_ip_reserved_ignore support"

Revert "net/miniupnpd: ext_ip_reserved_ignore support"

This patch is causing several issues [1], which then were reported to
upstream [2] and it was not accepted by upstream [3]. This results that
nobody maintain this custom patch and it is not useful as it is changing
addr_is_reserved behavior.

[1] https://github.com/openwrt/packages/issues/15258
[2] https://github.com/miniupnp/miniupnp/issues/542
[3] https://github.com/miniupnp/miniupnp/pull/511

This reverts commit b76aa9919489f49b472a8f939f6d46ca33d05f64.

Signed-off-by: Josef Schlehofer <pepe.schlehofer@gmail.com>