openjdk: Download source drops ahead of time instead of allowing downloads during build

The openjdk build docs say that the releases should contain these drops, but they don't for some reason.

svn path=/nixpkgs/trunk/; revision=28477

pkgs/development/compilers/openjdk/default.nix

@@ -29,6 +29,20 @@ stdenv.mkDerivation rec {
     sha256 = "1qhwlz9y5qmwmja4qnxg6sn3pgsg1i11fb9j41w8l26acyhk34rs";
   };
 
+  jaxws_src_name = "jdk7-jaxws2_2_4-b03-2011_05_27.zip";
+
+  jaxws_src = fetchurl {
+    url = "http://download.java.net/glassfish/components/jax-ws/openjdk/jdk7/${jaxws_src_name}";
+    sha256 = "1mpzgr9lnbf2p3x45npcniy47kbzi3hyqqbd4w3j63sxnxcp5bh5";
+  };
+
+  jaxp_src_name = "jaxp145_01.zip";
+
+  jaxp_src = fetchurl {
+    url = "http://download.java.net/jaxp/1.4.5/${jaxp_src_name}";
+    sha256 = "1js8m1a6lcn95byplmjjs1lja1maisyl6lgfjy1jx3lqi1hlr4n5";
+  };
+
   buildInputs = [
     unzip
     procps
@@ -47,6 +61,11 @@ stdenv.mkDerivation rec {
   ];
 
   postUnpack = ''
+    ensureDir drops
+    cp ${jaxp_src} drops/${jaxp_src_name}
+    cp ${jaxws_src} drops/${jaxws_src_name}
+    export DROPS_PATH=$(pwd)/drops
+
     sed -i -e "s@/usr/bin/test@${coreutils}/bin/test@" \
       -e "s@/bin/ls@${coreutils}/bin/ls@" \
       openjdk/hotspot/make/linux/makefiles/sa.make 
@@ -73,7 +92,7 @@ stdenv.mkDerivation rec {
     "DEVTOOLS_PATH="
     "UNIXCOMMAND_PATH="
     "BOOTDIR=${jdk}"
-    "ALLOW_DOWNLOADS=true"
+    "DROPS_DIR=$(DROPS_PATH)"
   ];
 
   configurePhase = ''