FYI: remove find_run_target

[Tom Tromey <tromey at redhat dot com>]

I'm checking this in.

I noticed that find_run_target is not used.

Thanks to "git log -S" I was able to discover that the last use was
removed here:

    commit 2c862b3b5e7bd76a43a4c14a7c5151b8a036f2a6
    Author: Daniel Jacobowitz <dan@debian.org>
    Date:   Tue Jan 29 22:47:20 2008 +0000

            * Makefile.in (symfile.o): Update.
            * NEWS: Mention exec tracing support.
            * inf-ttrace.c (inf_ttrace_wait): Return TARGET_WAITKIND_EXECD for
            exec events.
    [...]

This patch removes the function.

Tested by rebuilding + grep.

Tom

2013-06-27  Tom Tromey  <tromey@redhat.com>

	* target.c (find_run_target): Remove.
        * target.h (find_run_target): Remove.

Index: target.c
===================================================================
RCS file: /cvs/src/src/gdb/target.c,v
retrieving revision 1.337
diff -u -r1.337 target.c
--- target.c	27 Jun 2013 19:38:24 -0000	1.337
+++ target.c	27 Jun 2013 19:51:47 -0000
@@ -3627,30 +3627,6 @@
   return -1;
 }
 
-/* Find a single runnable target in the stack and return it.  If for
-   some reason there is more than one, return NULL.  */
-
-struct target_ops *
-find_run_target (void)
-{
-  struct target_ops **t;
-  struct target_ops *runable = NULL;
-  int count;
-
-  count = 0;
-
-  for (t = target_structs; t < target_structs + target_struct_size; ++t)
-    {
-      if ((*t)->to_can_run && target_can_run (*t))
-	{
-	  runable = *t;
-	  ++count;
-	}
-    }
-
-  return (count == 1 ? runable : NULL);
-}
-
 /*
  * Find the next target down the stack from the specified target.
  */
Index: target.h
===================================================================
RCS file: /cvs/src/src/gdb/target.h,v
retrieving revision 1.263
diff -u -r1.263 target.h
--- target.h	4 Jun 2013 13:10:53 -0000	1.263
+++ target.h	27 Jun 2013 19:51:48 -0000
@@ -1948,8 +1948,6 @@
 extern void find_default_create_inferior (struct target_ops *,
 					  char *, char *, char **, int);
 
-extern struct target_ops *find_run_target (void);
-
 extern struct target_ops *find_target_beneath (struct target_ops *);
 
 /* Read OS data object of type TYPE from the target, and return it in