patch 9.0.0058: Win32: cannot test low level events

Problem:    Win32: cannot test low level events.
Solution:   Add "sendevent" to test_gui_event(). (Yegappan Lakshmanan,
            closes #10679)
diff --git a/src/version.c b/src/version.c
index ee421e4..4db3a24 100644
--- a/src/version.c
+++ b/src/version.c
@@ -736,6 +736,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    58,
+/**/
     57,
 /**/
     56,