mariadb: fix by disabling automatic output actions

Now qt4 builds again.

I failed to split headers away from the libs
while making qt4 still detect and use mysql.

pkgs/servers/sql/mariadb/default.nix

@@ -56,6 +56,8 @@ stdenv.mkDerivation rec {
   enableParallelBuilding = true;
 
   outputs = [ "out" "lib" ];
+  setOutputFlags = false;
+  moveToDev = false;
 
   prePatch = ''
     substituteInPlace cmake/libutils.cmake \