Migrate from Wireless Extensions to mac80211/cfg80211

[Caellian]

the version of conky available in the fedora repository does not support wifi.

Conky uses an old library to access wifi data from your system. This library is now deprecated in fedora.

hence fedora packages conky without wireless support since fedora 36 :(

Originally posted by @ernesto1 in https://github.com/brndnmtthws/conky/issues/1664#issuecomment-1918308964

Related build options: BUILD_WLAN

Old include is libiw.h, new structures are:

• cf80211_ops – from net/cfg80211.h
• ieee80211_ops – from net/mac80211.h

Working on this issue requires appropriate kernel options enabled (otherwise required headers are missing).

Developer guide: https://www.kernel.org/doc/html/v4.9/80211/index.html

[Caellian]

Closing as duplicate of #1001.