In JDK-8195689, the was no longer checked in, but locally generated. The selected location for generation ($TOPDIR/.build) was not unproblematic for some use cases. This patch attempts remedy this.

The new behaviour will be this:
 * If run from $TOPDIR, the storage directory will be $TOPDIR/build/.configure-support.  * If run from $CUSTOM_ROOT, the storage directory will be $CUSTOM_ROOT/build/.configure-support.  * If run from any other directory (about to become the build output directory for the configuration), the storage directory will be $PWD/configure-support.

This will allow "rm -rf $TOPDIR/build" to function as before to remove all build artifacts. It will allow configuration created in out-of-tree directories to have the script generated locally.

I could not put the output file in build/$BUILD/configure-support, since the $BUILD name is not yet determined. I did not want to put it in build/configure-support, since that would make it look like a configuration to the code that enumerates configurations in build.

I hope this addresses all issues that has been raised.



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