Apparently this is more stable historically... boggle
Really fix @INC munging of the taint test

Now runs even with a plain `perl t/54taint.t`
Make sure the taint test does some DB-level ops
Harden t/54taint.t against possible future changes in -T
Remove vestigial unused @INC munge found after a8de639b
Fix travis prereq extractor (not sure how this ever worked...)