RFR: 8016520: jdk native build does not fail on compilation error on windows

[Tim Bell]

Erik:

> When fixing "8011687: Support correct dependencies from header files 
> on windows and solaris", the build stopped failing on native 
> compilation errors on windows. This was caused by piping the compiler 
> output to 'tee' which prevented the shell from picking up the exit 
> value of the compiler. This patch fixes the problem by saving the exit 
> value to a temporary file in the build output dir.
>
> http://cr.openjdk.java.net/~erikj/8016520/webrev.root.01

Looks good.

Tim