patch 8.2.4238: *.tf file could be fileytpe "tf" or "terraform"

Problem:    *.tf file could be fileytpe "tf" or "terraform".
Solution:   Detect the type from the file contents. (closes #9642)

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    4238,
 /**/
     4237,
 /**/