Boost with-filesystem requires with-atomic, so adding with-atomic. (P…

…erhaps jkontrik discovered the same earlier.)

conanfile.py

@@ -28,8 +28,8 @@ def configure(self):
         if self.options.build:
             # Currently need all headers;
             # plus libs: chrono, filesystem, program_options, thread, timer (and all headers).
+            # `filesystem` requires `atomic`.
             # (Boost provides the with_* way of specifying it also; the Conan Boost pkg only has without_*.)
-            self.options["boost"].without_atomic = True
             self.options["boost"].without_container = True
             self.options["boost"].without_context = True
             self.options["boost"].without_contract = True