[l2h] Configuration issues

[L Srinivasa Mohan]

Dear Maintainer

The configure script fails to recognize gs versions if a tester release
is used. Adding TESTER RELEASE to $SRCDIR/config/config.pl at line 978
in latex2html99.2beta6 release helps.

Thanks for doing a great work.

-- 
The reward of a thing well done is to have done it.
   -- Emerson