Import the upstream Whirlpool.c as-is

As it turns out the _whirlpool.c we had here was a combo of the upstream
Whirlpool.c and nessie.h files, with some slight irrelevant
changes. Just copy in the upstream as-is.
Do the loading at BEGIN time & use warnings
Update .gitignore for having a Whirlpool.c
Bump to 1.0.9
Update ppport.h
Bump Module::Install to the latest upstream version
Update Manifest for recent changes