Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

Sync the EFI headers with version 1.10.14.62 of the Intel sample EFI
implementation. This re-introduces C99 style comments that previously
were replaced by original C comments.

Don't try to use 'typedef struct foo' if just 'struct foo' makes more sense
and works on all compilers. This also removes the need for
__CC_SUPPORTS_FORWARD_REFERENCE_CONSTRUCT in <sys/cdefs.h>.

OK'ed by: marcel, dfr

An almost mechanical sweep to replace C++ style comments with C
style comments. This is not an attempt to conform to style(9).
Such has lower priority.

First approximation of an ia64 EFI loader. Not functional.