Log Message:
Update to 2.5.36. Add build dependencies on gtexinfo and two tex
packages needed to build pdf documentation, since there is no
configure option to disable it that I can see. If this leads to
problems, we'll have to disable it with a patch.

* version 2.5.36

** various portability fixes that quiet compiler warnings on 64-bit
   hosts

** various manual fixes, including correcting the name of a %option and
   updating some simple examples to use ANSI C syntax

** various bug fixes that prevent certain error conditions from
   persisting when they should not persist

** improvements to the test suite so it behaves better when linking
   compiled files

** new translations from the translation project: ca, da, es, fi, fr,
   ga, ko, pt_br, ro, ru, sv, tr, zh_cn

** the flex distribution is now built with automake 1.10.1 and automake
   2.61