- set compile definitons (FAIL=1) correctly for .prelink.elf in
  coredos_executable macro
- use Null_Stream for kout and debug in FAIL* binaries
- disable debug, serial output in Bochs for FAIL* testing
- add proper CMake dependency on linker scripts

Change-Id: Ib5688a32838a1b988997afbf0963a12592c56cf8