[osx-setup] Host the JDK .pkg internally

I'd like to get Java.Interop building on a continuous integration
system, and if (when) we start building native libraries on OS X we'll
need a way to reliably, *automatically*, download the correct .pkg to
get the JavaVM.framework development headers.

Update the `make osx-setup` target to download an internally-hosted
JavaDeveloper-2013005_dp__11m4609.pkg file, and implicitly download
and extract it when needed.

.gitignore

@@ -1,5 +1,6 @@
 bin
 obj
+JavaDeveloper-2013005_dp__11m4609.pkg
 LocalJDK
 TestResult.xml
 xa-gendarme.html

Makefile

@@ -31,17 +31,18 @@ clean:
 	$(XBUILD) /t:Clean
 	rm -Rf bin/$(CONFIGURATION)
 
-JDK     = JavaDeveloper.pkg
-JDK_URL = http://adcdownload.apple.com/Developer_Tools/java_for_os_x_2013005_developer_package/java_for_os_x_2013005_dp__11m4609.dmg
+JDK     = JavaDeveloper-2013005_dp__11m4609.pkg
+JDK_URL = http://storage.bos.xamarin.com/android-sdk-tool/archives/JavaDeveloper-2013005_dp__11m4609.pkg
+
+APPLE_JDK_URL     = http://adcdownload.apple.com/Developer_Tools/java_for_os_x_2013005_developer_package/java_for_os_x_2013005_dp__11m4609.dmg
 
 LOCAL_JDK_HEADERS = LocalJDK/System/Library/Frameworks/JavaVM.framework/Versions/A/Headers
 
 osx-setup: $(LOCAL_JDK_HEADERS)/jni.h
 
 $(LOCAL_JDK_HEADERS)/jni.h:
 	@if [ ! -f $(JDK) ]; then \
-		echo "Please download '$(JDK)', from: $(JDK_URL)" ; \
-		exit 1; \
+		curl -o $(JDK) $(JDK_URL) ; \
 	fi
 	-mkdir LocalJDK
 	_jdk="$$(cd `dirname "$(JDK)"`; pwd)/`basename "$(JDK)"`" ; \

README.md

@@ -30,7 +30,12 @@ The `JNIEnv` API is also huge, unwieldy, and terrible.
 The current Oracle JDK7 installer only provides 64-bit binaries, while
 Mono for OS X is currently a 32-bit binary. These don't work together. :-(
 
-Consequently, you must download the Apple OS X Java 6 developer package:
+To quickly get a JDK that is usable with the OS X `JavaVM.framework`, run:
+
+    $ make osx-setup
+
+If you're instead a glutton for punishment, or you need to check for
+an updated `.pkg` for some future `JavaVM.framework` version:
 
  1. Go to the [Downloads page](https://developer.apple.com/downloads/index.action).  
     Note: This may require you to login first.