Bug#95147: tetex-extra: Minor error in slidesec style package.

[brian@debian.org (Brian Mays)]

> I am not sure but there is
> 
> \def\makeslidesubheading{\makeslideheading}
> 
> just below the lines, so the original might be not a problem.
> 
> # Am I missing something?

By default, this is not a problem, which is probably why this bug has
not been noticed before now.  The reason that the \makeslideheading
and \makeslidesubheading macros are used is to allow the user to
redefine them and thereby provide a different style for his slides.
That is, if I redefine \makeslidesubheading to another macro, my new
definition should be used by the \slide@subheading macro.  Currently,
it is not, which is why the change is needed.

- Brian