Delete obsolete /* ARGSUSED */ lint comments.

ok miod@ millert@

Clean up the includes in mg.
This does the following:
Moves all POSIX headers from sysdef.h into the individual .c files so that
each file now only includes what it needs. All headers are properly so

Clean up the includes in mg.
This does the following:
Moves all POSIX headers from sysdef.h into the individual .c files so that
each file now only includes what it needs. All headers are properly sorted.
Moves the remainder of sysdef.h to other files (mostly def.h) and deletes
sysdef.h now that it's no longer contains anything.
Tweak a comment that references sysdef.h so that it no longer does that.
ok florian@

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Add explicit public domain notices to all public domain files.
ok millert@, deraadt@

This is a no binary change which does:

- spelling, punctuation fixes
- variable declaration lineup
- use parentheses for return and sizeof
- K&R function declarations -> ANSI
- other minor code beau

This is a no binary change which does:

- spelling, punctuation fixes
- variable declaration lineup
- use parentheses for return and sizeof
- K&R function declarations -> ANSI
- other minor code beautification

ok henning@

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some string formats.
vincent@ ok

Finish KNF of prototypes. That should be all of them.
OK vincent@

version string is constant

$OpenBSD$

More -Wall anmd KNF, from op2@tomahawk.SQUiSH.org

The start of KNF + -Wall. The code has been run through indent but
needs hand fixup. I stopped at keymap.c...

initial import of mg2a