patch 9.0.0395: clang warnings for function prototypes

Problem:    Clang warnings for function prototypes.
Solution:   Remove incomplete function prototypes. (closes #11068)

Author: pheiduck

src/version.c

@@ -703,6 +703,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    395,
 /**/
     394,
 /**/

src/xxd/xxd.c

@@ -134,9 +134,6 @@ extern void perror __P((char *));
 # endif
 #endif
 
-extern long int strtol();
-extern long int ftell();
-
 char version[] = "xxd 2022-01-14 by Juergen Weigert et al.";
 #ifdef WIN32
 char osver[] = " (Win32)";