[autotools] perl5 and help2man

[Sylvain BERTRAND]

Hi,
I'm building a home-made "Linux-From-Scratch" (LFS) and when I tried to build
bison, release 3.0.2, I got troubles with perl5 autoconf detection (no perl5 on
my LFS) and a help2man (no help2man on my LFS) hardcoded in the compiling
stage.

I did remove manualy the perl5 detection from the autoconf generated
configure. I did remove manualy some man page generation parts from the
Makefile.in. Then, bison configured, compiled and installed fine.

regards,

-- 
Sylvain BERTRAND

P.S. tell me if you need the configure and Makefile.in patches in order
to fix the configure.ac and Makefile.am