Make `brew install subversion --perl` work.
Keep the jenkins audit happy by using #{lib} instead of #{prefix}/lib
Add links to the report made to subversion to get this issue fixed.
Turns out that the swigutil_pl.c patch was not needed when we are no longer building in parallel.
Add a comment for the remaining patch above the patch def block.
Fix 'brew install --with-python subversion'

Derived from https://github.com/mxcl/homebrew/pull/22668