depthcharge was: Ignoring pdftex primitives

[David Carlisle]

> For David:
> you need three \noexpands because TeX is looking for three keywords 

ah of course, yes.  tex is only expanding looking for the first non
acceptable token, so the number of \noexpands goes up one at a time
rather than going up in powers of 2, as typically needed in an edef.

so I should change pdftex.def to always add space and three \noexpands
and an \@empty between the size spec and the file name, so that

\includegraphics[xxx=yyy]{depthcharge}

will work.

It might even get in the release planned for 1998/12/01...

David