Fix frv libgloss bits for c99/gcc-14

[Jeff Law]

Same as we've seen elsewhere.  Add missing prototype and header include.

Pushed to the trunk.

Jeff L.
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commit 9f3e8ba3b25e162a3c1f383a4c7a84b96fa81cd6
Author: Jeff Law <jeffreyalaw@gmail.com>
Date:   Fri Dec 22 20:40:21 2023 -0700

    Fix frv libgloss bits for c99/gcc-14\
    
    Same as we've seen elsewhere.  Add missing prototype and header include.

diff --git a/libgloss/frv/putnum.c b/libgloss/frv/putnum.c
index a07315e13..b2b2c4435 100644
--- a/libgloss/frv/putnum.c
+++ b/libgloss/frv/putnum.c
@@ -14,6 +14,8 @@
  */
 #include "glue.h"
 
+extern void print (char *ptr);
+
 /*
  * putnum -- print a 32 bit number in hex
  */
diff --git a/libgloss/frv/sim-inbyte.c b/libgloss/frv/sim-inbyte.c
index 9d39751b3..f5f49b9b3 100644
--- a/libgloss/frv/sim-inbyte.c
+++ b/libgloss/frv/sim-inbyte.c
@@ -14,6 +14,8 @@
  * they apply.
  */
 
+#include <unistd.h>
+
 int
 inbyte ()
 {