Fixes.

    * new/gcc.jam: gcc.link can handle LIB, not only STATIC-LIB
    * new/generators.jam (composing-generator.run): Accept derived
        types.


[SVN r15942]

tools/build

@@ -1 +1 @@
-Subproject commit 18b1b42fe2f6ed4c6098197c5772997398d395af
+Subproject commit c866a673a4baa813b06e8d8a3367f92656ad0d6f