patch 8.0.0192: cannot build with tiny features

Problem:    Build fails with tiny features.
Solution:   Change #ifdef for hash_clear().  Avoid warning for unused
            argument.
diff --git a/src/version.c b/src/version.c
index bf4b82d..a825013 100644
--- a/src/version.c
+++ b/src/version.c
@@ -765,6 +765,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    192,
+/**/
     191,
 /**/
     190,