Libraries - fix some warnings with gcc ≥12 #9244
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currently, only w/ mock build because it is using gcc>=12
> ../../libraries/ESP8266WebServer/src/detail/RequestHandlersImpl.h:14:15: warning: ‘String esp8266webserver::calcETag(fs::FS&, const String&)’ defined but not used [-Wunused-function]
> 14 | static String calcETag(FS &fs, const String &path) {
> | ^~~~~~~~
> error: designated initializers cannot be used with a non-aggregate type '...' gcc10.3 allowed this construct for some reason
> error: infinite recursion detected [-Werror=infinite-recursion]
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ESP8266WebServer - unused static function / function inside of namespace { ... } would always trigger '-Wunused-function'
ESP8266WiFiMesh - class constructors used instead of aggregates. gcc10.3 allows this for some reason, but not later versions
LEAmDNS - consistent const <-> non-const accessors for
findIP4Address()andanswerAtIndex()