S-6341:make sure to unlock too
Tweak sndfile for args
Make sure -w is set in mod_perl CXXFLAGS

Autogenerated bits of the code warn when building which would
otherwise break the build.
Export V=1 for debian builds

Now that we're using AM_SILENT_RULES this needs to be set so we can
see what's going on in our build logs.
fix perldir to at least point to install the same place as the code looks for it.  Note, on fhs type builds, where prefix is /usr, these files are going to go into /usr/perl, which probably isn't right, but thats where the code looks too, we should do something better for builds that are not in the prefix