mumble: unpin protobuf (#322756)

fixes pkgsMusl.mumble after musl 1.2.5 upgrade

Author: yuyuyureka

pkgs/applications/networking/mumble/default.nix

@@ -27,6 +27,7 @@ let
 
     cmakeFlags = [
       "-D g15=OFF"
+      "-D CMAKE_CXX_STANDARD=17" # protobuf >22 requires C++ 17
     ] ++ (overrides.configureFlags or [ ]);
 
     preConfigure = ''

pkgs/top-level/all-packages.nix

@@ -32818,14 +32818,12 @@ with pkgs;
       avahi = avahi-compat;
       pulseSupport = config.pulseaudio or false;
       iceSupport = config.murmur.iceSupport or true;
-      protobuf = protobuf_21;
     }).murmur;
 
   mumble = (callPackages ../applications/networking/mumble {
       avahi = avahi-compat;
       jackSupport = config.mumble.jackSupport or false;
       speechdSupport = config.mumble.speechdSupport or false;
-      protobuf = protobuf_21;
     }).mumble;
 
   mumble_overlay = callPackage ../applications/networking/mumble/overlay.nix {