patch 8.1.0213: CTRL-W CR does not work properly in a quickfix window

Problem:    CTRL-W CR does not work properly in a quickfix window.
Solution:   Split the window if needed. (Jason Franklin)
diff --git a/src/proto/quickfix.pro b/src/proto/quickfix.pro
index d32655f..26a5de0 100644
--- a/src/proto/quickfix.pro
+++ b/src/proto/quickfix.pro
@@ -7,6 +7,7 @@
 void qf_age(exarg_T *eap);
 void qf_history(exarg_T *eap);
 void qf_mark_adjust(win_T *wp, linenr_T line1, linenr_T line2, long amount, long amount_after);
+void qf_view_result(int split);
 void ex_cwindow(exarg_T *eap);
 void ex_cclose(exarg_T *eap);
 void ex_copen(exarg_T *eap);