patch 8.2.3387: compiler warning for non-static function

Problem:    Compiler warning for non-static function.
Solution:   Make the function static. (Dominique Pellé, closes #8816)

Author: dpelle

src/strings.c

@@ -127,7 +127,7 @@ csh_like_shell(void)
 /*
  * Return TRUE when 'shell' has "fish" in the tail.
  */
-    int
+    static int
 fish_like_shell(void)
 {
     return (strstr((char *)gettail(p_sh), "fish") != NULL);

src/version.c

@@ -755,6 +755,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    3387,
 /**/
     3386,
 /**/