patch 8.0.1752: qf_set_properties() is to long

Problem:    qf_set_properties() is to long.
Solution:   Refactor the function.  Define INVALID_QFIDX. (Yegappan
            Lakshmanan, closes #2812)
diff --git a/src/version.c b/src/version.c
index ac6e0e8..fda91e2 100644
--- a/src/version.c
+++ b/src/version.c
@@ -762,6 +762,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1752,
+/**/
     1751,
 /**/
     1750,