* include/ruby/ruby.h: rename RARRAY_RAWPTR() to RARRAY_CONST_PTR().
  RARRAY_RAWPTR(ary) returns (const VALUE *) type pointer and
  usecase of this macro is not acquire raw pointer, but acquire
  read-only pointer. So we rename to better name.
  RSTRUCT_RAWPTR() is also renamed to RSTRUCT_CONST_PTR()
  (I expect that nobody use it).
* array.c, compile.c, cont.c, enumerator.c, gc.c, proc.c, random.c,
  string.c, struct.c, thread.c, vm_eval.c, vm_insnhelper.c:
  catch up this change.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43043 b2dd03c8-39d4-4d8f-98ff-823fe69b080e