New jre layout broke Maven and Ant

[Henri Gomez]

> This also broke building OpenJDK8 (mlvm)
>
> The build system for OpenJDK 8 requires a working Java 1.7.
>
> The build fails with this error (confusing because I have ant v1.8.2 installed):
>
>  ANT_VER = 1.7.0. [requires at least 1.7.1]
>
> When ant -version is called from the build scripts this is the output:
>
> Unable to locate tools.jar. Expected to find it in /Users/stephen/Library/Java/JavaVirtualMachines/1.7.0.jdk/Contents/Home/1.7.0.jre/Contents/Home/lib/tools.jar Apache Ant(TM) version 1.8.2 compiled on June 3 2011
>
> And unfortunately the code that looks for a version string finds the Java version '1.7.0' first:
>
>  jdk/make/shared/common/Defs.gmk:135
>

Yes, we should get back to regular layout, ie the same one used in
Linux, BSD and Windows (and Solaris I think).

OpenJDK being Java 7 RI, having a common / consistent layout for all
platforms executing it, is just mandatory.
Using symlink hacks to solve detection of locations problems are
dirty, and requiring app developers to add specific hacks for OpenJDK
7 on OSX, will slow down its adoption on OS/X.
Seeing the hard works done on porting Apple works on OpenJDK, it will
be a strange signal to OSX users/developpers community.

Cheers