Rewrite and filling of libc/ctype.c (thus adjusting copyright line).
Use a simple one-liner for each of the functions. You can surely optimize
the code some more, but I chose not to do that in order to keep it readable.
When compiling with -Os the size differences are minimal.
Signed-off-by: Uwe Hermann <email@example.com>
Acked-by: Jordan Crouse <firstname.lastname@example.org>