Valgrind now uses a Boost.MySQL-specific b2 feature

[anarthal]

close #338

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.03%. Comparing base (69c457a) to head (21a9598).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #339   +/-   ##
========================================
  Coverage    99.03%   99.03%           
========================================
  Files          144      144           
  Lines         7122     7122           
========================================
  Hits          7053     7053           
  Misses          69       69           

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