Remove two unused hooks

I noticed that a couple of deprecated hooks aren't ever called, so
they can't really be used by Insight.  This patch removes them
entirely.  I checked the Insight sources, and these aren't mentioned
there, either.
diff --git a/gdb/tracepoint.c b/gdb/tracepoint.c
index a347745..b45763e 100644
--- a/gdb/tracepoint.c
+++ b/gdb/tracepoint.c
@@ -72,11 +72,6 @@
    large.  (400 - 31)/2 == 184 */
 #define MAX_AGENT_EXPR_LEN	184
 
-/* A hook used to notify the UI of tracepoint operations.  */
-
-void (*deprecated_trace_find_hook) (char *arg, int from_tty);
-void (*deprecated_trace_start_stop_hook) (int start, int from_tty);
-
 /* 
    Tracepoint.c:
 
diff --git a/gdb/tracepoint.h b/gdb/tracepoint.h
index c57afc0..4aa8c05 100644
--- a/gdb/tracepoint.h
+++ b/gdb/tracepoint.h
@@ -314,11 +314,6 @@ extern void
   parse_static_tracepoint_marker_definition (const char *line, const char **pp,
 					     static_tracepoint_marker *marker);
 
-/* A hook used to notify the UI of tracepoint operations.  */
-
-extern void (*deprecated_trace_find_hook) (char *arg, int from_tty);
-extern void (*deprecated_trace_start_stop_hook) (int start, int from_tty);
-
 /* Returns the current traceframe number.  */
 extern int get_traceframe_number (void);