move lang-specific modules, e.g. (system il compile) to (language ghil compile-glil)

move lang-specific modules, e.g. (system il compile) to (language ghil compile-glil)

* configure.in: Remove module/system/il directory.

* module/language/ghil/Makefile.am (SOURCES):
* module/language/ghil/compile-glil.scm (system):
* module/language/ghil/def.scm (language):
* module/language/ghil/spec.scm (language, ghil):
* module/language/glil/Makefile.am (SOURCES):
* module/language/glil/compile-objcode.scm (language):
* module/language/glil/def.scm (language):
* module/language/glil/spec.scm (language, compile):
* module/language/scheme/Makefile.am (SOURCES):
* module/language/scheme/inline.scm (system, define-inline):
* module/language/scheme/translate.scm (language): Move files, renaming
  the modules.

* module/oop/goops.scm (load-toplevel): Unfortunately the GHIL name
  leaked here. Patch it up.

* module/system/vm/Makefile.am (SOURCES): Remove assemble.scm.