PR libstdc++/88170
	* c-pretty-print.c (pp_c_enumeration_constant): Print always as
	a C cast in pp_c_flag_gnu_v3 mode.

	* cxx-pretty-print.c (pp_cxx_enumeration_constant): Print always as
	a C cast in pp_c_flag_gnu_v3 mode.

From-SVN: r268413