OpenWrt trunk's lowest supported GCC version is 4.8, so we don't need
to depend on specific versions anymore. Fixes visibility with GCC 5,
the current default.

Signed-off-by: Jonas Gorski <jogo@openwrt.org>

Signed-off-by: Jonas Gorski <jogo@openwrt.org>

ZNC 1.6.0 now verifies SSL certificates on connect, and some Servers
do not use a valid one (e.g. freenode).

Signed-off-by: Jonas Gorski <jogo@openwrt.org>

Signed-off-by: Jonas Gorski <jogo@openwrt.org>

Fixes compilation with musl.

Requires GCC 4.7 or newer, so broken for octeon.

Signed-off-by: Jonas Gorski <jogo@openwrt.org>

Using mips16 seems to make znc randomly crash.

Signed-off-by: Jonas Gorski <jogo@openwrt.org>

ZNC uses a map to cache channel memebers on join. Unfortunately uclibc++
uses a naive linked-list implementation with horrible performance, which
can cause joins to take a few minutes on popular channels.

Therefore Switch to libstdc++ which uses a much more performant hashmap.
ZNC by itself is already rather large, so the added footprint of
libstd++ vs uclibc++ does not matter that much anyway.

Should fix #11778.

Signed-off-by: Jonas Gorski <jogo@openwrt.org>

Signed-off-by: Jonas Gorski <jogo@openwrt.org>

Signed-off-by: Jonas Gorski <jogo@openwrt.org>