patch 9.0.2166: Memory leak in Configure Script when checking GTK

Problem:  Memory leak in Configure Script when checking GTK
Solution: Free the allocated memory

If the memory is not freed, GTK GUI VIM cannot be build with address
sanitizer for debugging purposes - configure script will report missing
GTK, because the testing file compilation fails due reported memory
leak.

closes: #13672

Signed-off-by: Zdenek Dohnal <zdohnal@redhat.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/version.c b/src/version.c
index 6c9bb45..a2623b8 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2166,
+/**/
     2165,
 /**/
     2164,