Remove scm_puts_unlocked.

* libguile/ports.h (scm_puts_unlocked): Remove.
* libguile/ports.c (scm_puts): Replace implementation with
  scm_puts_unlocked's implementation.
* libguile/arbiters.c:
* libguile/backtrace.c:
* libguile/bitvectors.c:
* libguile/continuations.c:
* libguile/deprecation.c:
* libguile/dynl.c:
* libguile/eval.c:
* libguile/filesys.c:
* libguile/fluids.c:
* libguile/foreign.c:
* libguile/fports.c:
* libguile/frames.c:
* libguile/guardians.c:
* libguile/hashtab.c:
* libguile/hooks.c:
* libguile/load.c:
* libguile/macros.c:
* libguile/mallocs.c:
* libguile/print.c:
* libguile/programs.c:
* libguile/promises.c:
* libguile/smob.c:
* libguile/srcprop.c:
* libguile/srfi-14.c:
* libguile/stackchk.c:
* libguile/struct.c:
* libguile/threads.c:
* libguile/throw.c:
* libguile/values.c:
* libguile/variable.c:
* libguile/vm.c:
* libguile/weak-set.c:
* libguile/weak-table.c: Use scm_puts instead of scm_puts_unlocked.

libguile/srcprop.c

@@ -104,7 +104,7 @@ static int
 srcprops_print (SCM obj, SCM port, scm_print_state *pstate)
 {
   int writingp = SCM_WRITINGP (pstate);
-  scm_puts_unlocked ("#<srcprops ", port);
+  scm_puts ("#<srcprops ", port);
   SCM_SET_WRITINGP (pstate, 1);
   scm_iprin1 (scm_srcprops_to_alist (obj), port, pstate);
   SCM_SET_WRITINGP (pstate, writingp);