qt5: use 5.11 on darwin until it's fixed

Fixes: 8e811ec ('qt5: 5.11 -> 5.12')
Resolves: #53841

Author: veprbl

pkgs/top-level/all-packages.nix

@@ -12226,8 +12226,9 @@ in
 
   libsForQt512 = recurseIntoAttrs (lib.makeScope qt512.newScope mkLibsForQt5);
 
-  qt5 = qt512;
-  libsForQt5 = libsForQt512;
+  # TODO bump to 5.12 on darwin once it's not broken
+  qt5 = if stdenv.isDarwin then qt511 else qt512;
+  libsForQt5 = if stdenv.isDarwin then libsForQt511 else libsForQt512;
 
   qt5ct = libsForQt5.callPackage ../tools/misc/qt5ct { };