[boost] [type traits] Removal of files broke regression tests

r68300 removed boost/type_traits/broken_compiler_spec.hpp and boost/type_traits/transform_traits_spec.hpp. Removing the first broke regression tests for iterator, python, and serialization. Removing the second doesn't appear to have done any harm. John Maddock did the r68300 commit. I'm assuming it was in response to Steve Kelly's r86250, "Remove use of obsolete BOOST_TT_BROKEN_COMPILER_SPEC", so the fix may be to remove the #includes that are causing all the errors rather than restoring the file. --Beman