Bug#671624: workaround

[marc.carter-ceqosy2@cool.fr.nf]

> Not sure, why you used \RequirePackage here, I could reproduce the
> problem when using \usepackage{graphicx}.

I'm not sure why I used \RequirePackage either - the original document
that broke in the etch->squeeze transation is autogenerated.

> After exchanging both \usepackage commands the minimal example
> compiles fine. Could you confirm if the document generates the
> expected results?

Indeed, swapping the two \usepackage statements works.  Thanks for the
workaround!

Ultimatetly this is still a bug to fix though, IMO.  The workaround is
not easy to discover.  In fact, the original document had many
\usepackage statements, and it took some effort just to discover which
two packages were in conflict.  Minimally, I would expect the graphicx
package to notice that invoice.sty had already been loaded, and give a
specific error about the needed sequencing.