The "elf.h" header changes involve only comments, the released
Plan 9 C preprocessing function does not cope with multiline
comments following the #define keyword.  All multiline comments
have been moved to the line above the associated definition.
Sigh!  Fixing the Plan 9 compiler is not an option.

<time.h> does not exist in the Plan 9 Native library.  I have
moved it from src/cmd/ld/pe.h to include/u.h. RSC correctly points
out that this copy of <u.h> is not the one used to compile the
Go release on Plan 9 platforms.

R=golang-dev
CC=golang-dev, rsc
https://golang.org/cl/4574042

R=rsc, brainman
CC=golang-dev
https://golang.org/cl/4146041

R=ken2
CC=golang-dev
https://golang.org/cl/1906042

R=rsc
https://golang.org/cl/157159

these guys really really want long to be 32-bits,
so ,s/long/int32/ (and then manual fixup).
still passes all tests.

(i started out looking for just those longs that
needed to be int32 instead, and it was just too hard
to track them down one by one.)

the longs were rare enough that i don't think
it will cause integration problems.

R=ken
OCL=13787
CL=13789

remove the dependency on /home/r.

SVN=122482