qt5.qtbase: Build all QPA backends by default

pkgs/development/libraries/qt-5/modules/qtbase.nix

@@ -221,7 +221,6 @@ stdenv.mkDerivation {
   # To prevent these failures, we need to override PostgreSQL detection.
   PSQL_LIBS = lib.optionalString (postgresql != null) "-L${postgresql.lib}/lib -lpq";
 
-  # -no-eglfs, -no-directfb, -no-linuxfb and -no-kms because of the current minimalist mesa
   # TODO Remove obsolete and useless flags once the build will be totally mastered
   configureFlags =
     [
@@ -328,11 +327,6 @@ stdenv.mkDerivation {
 
           "-libinput"
 
-          "-no-eglfs"
-          "-no-gbm"
-          "-no-kms"
-          "-no-linuxfb"
-
           ''-${lib.optionalString (cups == null) "no-"}cups''
           "-dbus-linked"
           "-glib"