message: Fix antlr directory name in setup script
  The directory name contained an extra 'i', which prevented the antlr4 library from compiling.
diff: @@ -58,7 +58,7 @@ def collectSourceFiles(baseDir, excludeDirs=[]):
  yield file
  BASE = "src/"
  -ANTLR4_BASE = BASE + "antlr4-runitime-cpp/"
  +ANTLR4_BASE = BASE + "antlr4-runtime-cpp/"
  ALL_SOURCE = list(collectSourceFiles(BASE, excludeDirs=[ANTLR4_BASE]))
  