Remove scm_putc_unlocked.

* libguile/ports.h (scm_putc_unlocked): Remove.
* libguile/ports.c (scm_putc): Replace implementation with
  scm_putc_unlocked's implementation.
  (scm_port_print): Use scm_putc.
* libguile/arbiters.c:
* libguile/arrays.c:
* libguile/bitvectors.c:
* libguile/bytevectors.c:
* libguile/continuations.c:
* libguile/dynl.c:
* libguile/eval.c:
* libguile/filesys.c:
* libguile/fluids.c:
* libguile/foreign.c:
* libguile/fports.c:
* libguile/frames.c:
* libguile/hashtab.c:
* libguile/hooks.c:
* libguile/macros.c:
* libguile/mallocs.c:
* libguile/print.c:
* libguile/programs.c:
* libguile/promises.c:
* libguile/r6rs-ports.c:
* libguile/smob.c:
* libguile/srcprop.c:
* libguile/struct.c:
* libguile/variable.c:
* libguile/weak-set.c:
* libguile/weak-table.c: Use scm_putc instead of scm_putc_unlocked.

libguile/srcprop.c

@@ -108,7 +108,7 @@ srcprops_print (SCM obj, SCM port, scm_print_state *pstate)
   SCM_SET_WRITINGP (pstate, 1);
   scm_iprin1 (scm_srcprops_to_alist (obj), port, pstate);
   SCM_SET_WRITINGP (pstate, writingp);
-  scm_putc_unlocked ('>', port);
+  scm_putc ('>', port);
   return 1;
 }