De-register fpu completion code.

There are pending changes to some of these files, and this would get in the
way.

ok claudio@ kettenis@

Change function definitions using the identifier-list form used in the
1st edition of Kernighan and Ritchie's The C Programming Language, to
that of the parameter-type-list form described in the ANSI

Change function definitions using the identifier-list form used in the
1st edition of Kernighan and Ritchie's The C Programming Language, to
that of the parameter-type-list form described in the ANSI X3.159-1989
standard.

In ISO/IEC 9899:2023 drafts, there is only one form of function definition.
"N2432 Remove support for function definitions with identifier lists".

ok kettenis@

show more ...

Remove the advertising clause in the UCB license which Berkeley
rescinded 22 July 1999. Proofed by myself and Theo.

Import netbsd's fpu handling (modified to be separate from sparc); this is
for paranoia's sake (don't want to break sparc32 while hacking on it).
Real work by art.