Log Message:
Update gxemul to 0.4.6.6.  Submitted by ISIHARA Takanori in PR pkg/39906.

Changes:
- Applying a patch from Kiyotaka Inaba which causes an ARM UND
  exception to be generated by the instruction word 0xe6000011, which
  is needed by gdb when running inside the emulator.  Also enabling
  ARM UND exceptions for ARM floating point instructions (needed by
  both Linux and NetBSD/arm).
- Fix for a free() bug in bootblock_iso9660.c.  Updating the
  OpenBSD/landisk installation instructions from 4.2 to 4.4, after
  verifying that it works.