correct "C" headers, higher priority

[Benjamin Kosnik]

[biting my tongue]

> They try to keep underlying C names (particularly nonstandard ones) from 
> polluting the global declaration space, although they cannot protect the 
> global link space.  Maybe abandoning that goal is the secret to simplifying 
> them enough to make the idea practical.

Yep. Something needs to be done, and this is a good place to start.