liblogging: -Wno-error fixups for gcc-14

pkgs/by-name/li/liblogging/package.nix

···
     "--enable-man-pages"
   ];
 
+  env.NIX_CFLAGS_COMPILE = "-Wno-error=implicit-int -Wno-error=implicit-function-declaration";
+
   meta = with lib; {
     homepage = "http://www.liblogging.org/";
     description = "Lightweight signal-safe logging library";