phpExtensions.mongodb: Move to separate directory

pkgs/development/php-packages/mongodb/default.nix

@@ -0,0 +1,20 @@
+{ buildPecl, lib, pkgs, pcre' }:
+
+buildPecl {
+  pname = "mongodb";
+
+  version = "1.6.1";
+  sha256 = "1j1w4n33347j9kwvxwsrix3gvjbiqcn1s5v59pp64s536cci8q0m";
+
+  nativeBuildInputs = [ pkgs.pkgconfig ];
+  buildInputs = with pkgs; [
+    cyrus_sasl
+    icu64
+    openssl
+    snappy
+    zlib
+    pcre'
+  ] ++ lib.optional (pkgs.stdenv.isDarwin) pkgs.darwin.apple_sdk.frameworks.Security;
+
+  meta.maintainers = lib.teams.php.members;
+}

pkgs/top-level/php-packages.nix

@@ -84,24 +84,7 @@ in
 
     memcached = callPackage ../development/php-packages/memcached { };
 
-    mongodb = buildPecl {
-      pname = "mongodb";
-      version = "1.6.1";
-
-      sha256 = "1j1w4n33347j9kwvxwsrix3gvjbiqcn1s5v59pp64s536cci8q0m";
-
-      nativeBuildInputs = [ pkgs.pkgconfig ];
-      buildInputs = with pkgs; [
-        cyrus_sasl
-        icu64
-        openssl
-        snappy
-        zlib
-        pcre'
-      ] ++ lib.optional (pkgs.stdenv.isDarwin) pkgs.darwin.apple_sdk.frameworks.Security;
-
-      meta.maintainers = lib.teams.php.members;
-    };
+    mongodb = callPackage ../development/php-packages/mongodb { };
 
     oci8 = buildPecl {
       version = "2.2.0";