patch 9.0.0749: alloc/free of buffer for each quickfix entry is inefficient

Problem:    Alloc/free of buffer for each quickfix entry is inefficient.
Solution:   Use a shared grow array. (Yegappan Lakshmanan, closes #11365)
diff --git a/src/version.c b/src/version.c
index d09422b..708e762 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    749,
+/**/
     748,
 /**/
     747,