bcopy(3) functions are prototyped in <strings.h> and not in
<string.h> anymore.
- Add a sentence about that to the respective HISTORY sections.
In the C source files:
- Include <string.h> or <strings.h> depending on what function
is to be compiled.
- Use ANSI-C function definitions.
o use braces to avoid potentially ambiguous else
o don't default to type int (and also remove a useless register
modifier).
o Use parens around assignment values used as truth values.
o Remove unused function.
Reviewed by: obrien and chuckr
