concatenation and copy functions using the '__restrict' macro.
This is to satisfy IEEE Std 1003-1.2001.
- Use ANSI-C function definitions.
- Add the 'restrict' keyword to the manual pages, too.
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
