patch 8.1.0694: when using text props may free memory that is not allocated

Problem:    When using text props may free memory that is not allocated.
            (Andy Massimino)
Solution:   Allocate the line when adjusting text props. (closes #3766)

src/version.c

@@ -799,6 +799,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    694,
 /**/
     693,
 /**/