Ruby

remove unused rb_obj_basic_to_s_p function

This hasn't been used since r36709 (2012-08-15)
("Kernel#inspect: improve consistency and do not call #to_s.")
and was never part of public API in include/ruby/

• class.c (rb_obj_basic_to_s_p): remove function
• internal.h (rb_obj_basic_to_s_p): remove declaration

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59208 b2dd03c8-39d4-4d8f-98ff-823fe69b080e