Resolve conflicts in favor of the upstream side where possible. Resolve a logical conflict in archive_windows.h where the upstream port to Watcom was done slightly differently from ours.
Conflicts: Utilities/cmlibarchive/CMakeLists.txt Utilities/cmlibarchive/libarchive/archive.h Utilities/cmlibarchive/libarchive/archive_entry.h Utilities/cmlibarchive/libarchive/archive_read_disk_posix.c Utilities/cmlibarchive/libarchive/archive_read_support_format_iso9660.c Utilities/cmlibarchive/libarchive/archive_windows.h Utilities/cmlibarchive/libarchive/archive_write_set_format_iso9660.c
Add Utilities/cmlibarchive using upstream libarchive 3.0.0-r3950 snapshot.
Brad King