* module/scripts/jslink.scm (link-file): psyntax needs to come last in
the list of dependencies, so need to append extra-dependencies
before boot-dependencies
* module/Makefile.am (SOURCES): Install runtime.js and jslink.scm
* module/language/js-il/compile-javascript.scm (compile-exp):
Compilation units take a continuation to facilitate linking.
* module/scripts/jslink.scm: New script.