Fix compilation issue with some compilers (when doing using Base::foo;, foo must be visible in the direct base class)
(transplanted from e15292115f145615b4b67ef6c3c5a80d0a6597e6)

--HG--
branch : 3.1
extra : transplant_source : %E1R%92%11_%14V%15%B4%B6%7E%F6%C3%C5%A8%0D%0Ae%97%E6