message: ensure PATH variable includes the TBB directory
diff: @@ -15,10 +15,12 @@ def runTests(String prefix = "") {
  }
  def runWinTests(String prefix = "") {
  + withEnv(['PATH+TBB=./stan/lib/stan_math/lib/tbb']) {
  """ mingw32-make -j${env.PARALLEL} build
  ${prefix}runCmdStanTests.py -j${env.PARALLEL} src/test/interface
  """
  }
  +}
  def deleteDirWin() {
  bat "attrib -r -s /s /d"
  