Fix frv libgloss bits for c99/gcc-14\

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

libgloss/frv/putnum.c

@@ -14,6 +14,8 @@
  */
 #include "glue.h"
 
+extern void print (char *ptr);
+
 /*
  * putnum -- print a 32 bit number in hex
  */

libgloss/frv/sim-inbyte.c

@@ -14,6 +14,8 @@
  * they apply.
  */
 
+#include <unistd.h>
+
 int
 inbyte ()
 {