Document the 'no-module' configuration option

Reviewed-by: NMatt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/8665)

INSTALL

@@ -409,6 +409,10 @@
   no-makedepend
                    Don't generate dependencies.
 
+  no-module
+                   Don't build any dynamically loadable engines.  This also
+                   implies 'no-dynamic-engine'.
+
   no-multiblock
                    Don't build support for writing multiple records in one
                    go in libssl (Note: this is a different capability to the