Remove getNetworkInterfaces and getBestPublicIp function.

They are not used at all and the windows version need some extra libs
that complexify the code.

Remove them for now. If it happens that they are needed, we will readd
them.

include/tools/networkTools.h

@@ -20,13 +20,10 @@
 #ifndef KIWIX_NETWORKTOOLS_H
 #define KIWIX_NETWORKTOOLS_H
 
-#include <map>
 #include <string>
 
 namespace kiwix
 {
-std::map<std::string, std::string> getNetworkInterfaces();
-std::string getBestPublicIp();
 std::string download(const std::string& url);
 }