Fix some obscure bugs.

    * new/virtual-target.jam (clone-template): Improve interface and logic.

    * new/make.jam (make-target-class.construct): Set type and suffix on
    generated targets.

    * new/generators.jam (construct): Make sure all targets have known
     types.


[SVN r15766]

tools/build

@@ -1 +1 @@
-Subproject commit 45ee2552867a864a8a22363c1e6b43fe8919fc94
+Subproject commit 742e30850e6bf4bdcad27500a5c75475a32e9c89