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)

WARNS=2 fixes, use __FBSDID, remove GCC-specific flags.

Use CFLAGS, not COPTS, in the Makefile. bsd.prog.mk conveniently adds
COPTS towards the end of final CFLAGS so that it can be used to
override Makefile and other defaults. Using it in Makefiles risks
having options set using it clobbered when somebody uses it on the
command line.

Approved by: bde

Add new option '-p pattern' for splitting files based on matching lines in
the file with a regular expression. Useful for e.g. 'cvs diff' output.
Also compile cleanly with -Wall and fix a few style bugs.
PR: bin/9405

This commit was generated by cvs2svn to compensate for changes in r1590,
which included commits to RCS files with non-trunk default branches.

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