patch 8.2.2295: incsearch does not detect empty pattern properly

Problem:    Incsearch does not detect empty pattern properly.
Solution:   Return magic state when skipping over a pattern. (Christian
            Brabandt, closes #7612, closes #6420)
diff --git a/src/globals.h b/src/globals.h
index dcb0f63..e4e73f2 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -1945,7 +1945,6 @@
 #define FOR_ALL_LIST_ITEMS(l, li) \
     for ((li) = (l)->lv_first; (li) != NULL; (li) = (li)->li_next)
 
-// While executing a regexp and set to MAGIC_ON or MAGIC_OFF this overrules
-// p_magic.  Otherwise set to MAGIC_NOT_SET.
-
-EXTERN magic_T magic_overruled INIT(= MAGIC_NOT_SET);
+// While executing a regexp and set to OPTION_MAGIC_ON or OPTION_MAGIC_OFF this
+// overrules p_magic.  Otherwise set to OPTION_MAGIC_NOT_SET.
+EXTERN optmagic_T magic_overruled INIT(= OPTION_MAGIC_NOT_SET);