Remove some #ifdefs for user pointers.

Remove some #ifdefs for user pointers.

Even if Emacs is compiled without module support, we don't have to
comment out every bit of user pointer support.  Defining the basic
structures and functions and detecting user pointers in switch
statements is harmless, and we're already doing the same for module
functions.  Removing these #ifdefs makes the code a bit easier to
read.

* src/lisp.h (PVEC_USER_PTR, struct Lisp_User_Ptr, USER_PTRP)
(XUSER_PTR): Define unconditionally.

* src/data.c (Ftype_of):
* src/alloc.c (cleanup_vector):
* src/print.c (print_vectorlike):
* src/pdumper.c (dump_vectorlike): Remove #ifdef for user pointers.