Makefile target 'print-targets'
Merge pull request #39 from mikedilger/print-targets

Makefile target 'print-targets'
Don't forward fmt config to subformats

The configs aren't supposed to apply recursively
Stop using stamp files for multi-targets

It breaks dependency tracking
Stop destructuring a trait object reference

This broke upstream but we don't even need to do it.
Bump rust-openssl version
Show trait for SQLSTATEs:

 Useful for, if nothing else, debugging to determine which
 SQLSTATE occurred w/o comparing against a hundred or so possible
 states, nor loosely interpreting the message.