patch 8.1.0667: textprop test leaves file behind

Problem:    Textprop test leaves file behind.
Solution:   Delete the file. (Dominique Pelle, closes #3743)
diff --git a/src/version.c b/src/version.c
index ed29c8b..21a4956 100644
--- a/src/version.c
+++ b/src/version.c
@@ -800,6 +800,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    667,
+/**/
     666,
 /**/
     665,