As a result of the recent work in the build-infra sandbox, here is a batch of improvements and fixes to the build-infra structure. Some of these are needed to support the conversion of the building of an Oracle internal test framework, while other are general improvements.

A list of fixes included:
* Fix for LogFailures which did not work if $1 had a / in it's name.
* Improved vardeps handling in JavaCompilation.
* Improved LOG=info logging from SetupNativeCompilation.
* Add a COMP_DIR option to COMPARE_BUILD, to allow comparison of two specific subdirectories (and not only normal images).
* Improved error reporting in case of incorrect usage of paths to SetupJavaCompilation and SetupNativeCompilation.
* Improvements of the compare script for build result comparisions, including two new options --strip and --sort-symbols, which
will strip all binaries before comparing, and sort all native symbols (per library) before comparing them, respectively.
* Properly handle Java manifest files given by MANIFEST argument even with linebreak issues
* In JavaCompilation, add KEEP_DUPS argument (Do not remove duplicate file names from different source roots).