Configure: Show 'enable' and 'disable' config attributes

This makes a difference for './Configure HASH' and './Configure TABLE'

Reviewed-by: Tim Hudson <tjh@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/12933)
diff --git a/Configure b/Configure
index 22c0ecd..6219e2e 100755
--- a/Configure
+++ b/Configure
@@ -3162,6 +3162,8 @@
         "loutflag",
         "ex_libs",
         "bn_ops",
+        "enable",
+        "disable",
         "poly1035_asm_src",
         "thread_scheme",
         "perlasm_scheme",