clctypes.h: Don't rely on stddef.h for size_t and ptrdiff_t
Add all(igentype) builtin

Signed-off-by: Aaron Watry <awatry@gmail.com>
Reviewed-by: Tom Stellard <tom@stellard.net>
relational: Add isequal(floatN) builtin

Signed-off-by: Aaron Watry <awatry@gmail.com>
Reviewed-by: Tom Stellard <tom@stellard.net>
math: Implement mix builtin

Signed-off-by: Aaron Watry <awatry@gmail.com>
Reviewed-by: Tom Stellard <tom@stellard.net>