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)

Revert most of r210764, now that mdocml does the right
thing with empty quotation macros.

Requested by: Alex Kozlov

mdoc: make sure to pass at least one argument to quotation macros

- Update GCC reference from 3.3 to 4.2 [1]
- Add reference to c99(7)

Submitted by: stefanf

mdoc: order prologue macros consistently by Dd/Dt/Os

Although groff_mdoc(7) gives another impression, this is the ordering
most widely used and also required by mdocml/mandoc.

Reviewed by: ru
Approved by: philip, ed (mentors)

Bump the original revision of c89(1).

Sync program's usage() with manpage's SYNOPSIS.

Update URL of GCC status page to GCC 3.3

Approved by: simon(mentor)
Submitted by: Stefan Farfeleder <stefan@fafoe.narf.at>
PR: docs/63370

mdoc(7) police: overhaul.

Approved by: re

Add the c99(1) utility, which is nothing more than a synonym for
cc -std=iso9899:1999 -pedantic, and is required by SUSv3.

PR; 36087