build_apps: Use FreezeTool.__replacePaths() to cleanup tracebacks

This alters paths in tracebacks to contain just module names instead of
full, absolute paths. This makes tracebacks easier to read and leaks
less information about the build machine.

Closes #991

direct/src/dist/FreezeTool.py

@@ -1695,6 +1695,8 @@ class Freezer:
 
     def generateRuntimeFromStub(self, target, stub_file, use_console, fields={},
                                 log_append=False):
+        self.__replacePaths()
+
         # We must have a __main__ module to make an exe file.
         if not self.__writingModule('__main__'):
             message = "Can't generate an executable without a __main__ module."