[xtend][batch] BatchCompiler resolves symlinks, but should not #449048
When adding source path entries, compiler calls getCannonicalPath so
resolves symbolic links on UNIX. This cause e.g. AA processor to fail
because the linked source file points to a file which is probably
outside the workspace.

Change-Id: Ic1f359d41969c5a1798d33ce082481e25edd5151