MFC r289677:

Fix a ton of speelling errors

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

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

Make pr build with WARNS=6.

egetopt.c does not use any stdlib.h definations, nor it referenced any
symbol from other module, so remove reference of stdlib.h and extern.h.

Verified with: md5(1)

Revert most part of 200420 as requested, as more review and polish is
needed.

Remove unneeded header includes from usr.bin/ except contributed code.

Tested with: make universe

Make egetopt() return -1 not EOF, as getopt(3) do.

Reviewed by:markm

Modernise this code by rounding up the usual suspects: register keyword,
consts, ANSIfication of functions, proper use of __FBSDID() and so on.
This commit is non-functional from a code-execution perspective, but
pr(1) now compiles WARNS=6 clean.

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

BSD 4.4 Lite Usr.bin Sources