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)

Improve logging when -dm is specified: if the node is considered
out-of-date print not only "modified before source" message
but also the path of youngest source.

Move the Boolean and ReturnStatus stuff from sprite.h to util.h and
get rid of sprite.h.

Obtained from: DragonFlyBSD

Move the definitions of the OP_* constants from make.h into GNode.h
where they actually belong to. Move the definitions of the strings
for special macros like "$*" from make.h to parse.h - they're used
only in the parser.

Submitted by: Max Okumoto <okumoto@ucsd.edu> (7.211)

Remove the leading underscore from structure tags. All identifiers
with a leading underscore are in the implementation namespace.

Clean up include files and file including. Split nonints.h into pieces
that get included just where they are needed. All headers include the
headers that they need to compile (just with an empty .c file). Sort
includes alphabetically where apropriate and fix some duplicate commenting
for struct Job, struct GNode and struct Shell by removing one version and
inlining the comments into the structure declaration (the comments have been
somewhat outdated).

This patch does not contain functional changes (checked with md5).

Submitted by: Max Okumoto <okumoto@ucsd.edu>