patch 8.1.1891: functions used in one file are global

Problem:    Functions used in one file are global.
Solution:   Add "static". (Yegappan Lakshmanan, closes #4840)
diff --git a/src/ex_eval.c b/src/ex_eval.c
index 25a8684..f1a8b97 100644
--- a/src/ex_eval.c
+++ b/src/ex_eval.c
@@ -839,7 +839,7 @@
  * If something pending in a finally clause is resumed at the ":endtry", report
  * it if required by the 'verbose' option or when debugging.
  */
-    void
+    static void
 report_resume_pending(int pending, void *value)
 {
     if (p_verbose >= 14 || debug_break_level > 0)
@@ -856,7 +856,7 @@
  * If something pending in a finally clause is discarded, report it if required
  * by the 'verbose' option or when debugging.
  */
-    void
+    static void
 report_discard_pending(int pending, void *value)
 {
     if (p_verbose >= 14 || debug_break_level > 0)