qt5.15: restore the version override

I am bad at this.

K900 dd4afc7c 8169a7fc

+3 -1
+3 -1
pkgs/development/libraries/qt-5/5.15/srcs.nix
··· 2 3 let 4 version = "5.15.5"; 5 - overrides = {}; 6 7 mk = name: args: 8 let
··· 2 3 let 4 version = "5.15.5"; 5 + overrides = { 6 + qtscript.version = "5.15.4"; 7 + }; 8 9 mk = name: args: 10 let