message: cxx: Do not add static libraries in each other dependencies.
  They already depend on each others explicitely in the builder.
diff: @@ -1568,9 +1568,6 @@ class StaticLibLinker(ShellCommand):
  def __init__(self, objs, lib, tk, cfg):
  self.objs = objs
  self.__library = lib
  - for o in self.objs:
  - if isinstance(o, StaticLib):
  - lib.dependency_add(o)
  self.toolkit = tk
  self.config = cfg
  super().__init__(objs, [lib], None)
  