Building JDK7 on OS X 10.6.8

[Andrew ``Bass'' Shcheglov]

Hello,

I've created a patch which enables building OpenJDK 1.7 on Mac OS X
10.6.8. So far, I've got AWT and JFC/Swing applications successfully
running on Snow Leopard. The patch is currently available here:
<https://github.com/hgomez/obuildfactory/blob/master/openjdk7/macosx/patches/native-sun-osx106.patch>.

The original discussion is here:
<https://github.com/hgomez/obuildfactory/issues/3>.

4 Objective-C files are affected:

 * in sun/awt/AWTView.m, 10.7+ code is simply reimplemented with
10.6-only API
 * in sun/awt/CGraphicsDevice.m, 10.7+ code is simply stripped out: as
far as I understand, it's not that important.
 * in sun/java2d/opengl/CGLLayer.m, an UnsupportedOperationException is
thrown from the native code. I have no idea what the correct 10.6
replacement should be.
 * finally, sun/osxapp/ThreadUtilities.h features a minor 10.6-specific
correction.

The decision of which code branch to include at compile time is based on
the __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ preprocessor macro.

I'm asking Objective-C experts who read this list to review the patch
and propose any corrections/enhancements. Any feedback is appreciated.

Also, once the patch looks good to you, would it be possible to merge it
into the main code tree?

Regards,
Andrew.