druid: use mysql_jdbc directly

pkgs/by-name/dr/druid/package.nix

@@ -2,6 +2,7 @@
   lib,
   stdenv,
   fetchurl,
+  mysql_jdbc,
   extensions ? { },
   libJars ? [ ],
   nixosTests,
@@ -26,11 +27,6 @@ stdenv.mkDerivation (finalAttrs: {
     hash = "sha256-xppAoKNS/qB8WVMwBPxxHbOy5uDGl3IxrCWV1T+YQkE=";
   };
 
-  mysqlConnector = fetchurl {
-    url = "mirror://maven/mysql/mysql-connector-java/5.1.48/mysql-connector-java-5.1.48.jar";
-    hash = "sha256-VuJsqqOCH1rkr0T5x09mz4uE6gFRatOAPLsOkEm27Kg=";
-  };
-
   dontBuild = true;
 
   loadExtensions = (
@@ -61,7 +57,7 @@ stdenv.mkDerivation (finalAttrs: {
     runHook preInstall
     mkdir $out
     mv * $out
-    ${optionalString mysqlSupport "cp ${finalAttrs.mysqlConnector} $out/extensions/mysql-metadata-storage"}
+    ${optionalString mysqlSupport "ln -s ${mysql_jdbc}/share/java/mysql-connector-java.jar $out/extensions/mysql-metadata-storage"}
     ${finalAttrs.loadExtensions}
     ${finalAttrs.loadJars}
     runHook postInstall