libg++-2_8_2-980731 failed make check on egcs-19980824 on rs

[Joern Rennecke]

> We should decide if this is to be fixed by removing the protos from
> libg++ or by "fixing" the system headers to match libg++'s idea of
> ideal.

There is a third possibility: autoconf for the compatibility of the
prototype with the include.  If they don't mix, we probably have a
prototype in the header, and hence should leave out our own prototype.