This will allow for weak tables to be implemented partly in Scheme.
* module/ice-9/object-properties.scm: New file.
* am/bootstrap.am (SOURCES): Add new file.
* module/ice-9/boot-9.scm:
* module/ice-9/deprecated.scm (make-object-property*): Deprecate
make-object-property in default env and add a shim.
* module/ice-9/buffered-input.scm (ice-9):
* module/language/elisp/boot.el (plist-function):
* module/scripts/frisk.scm (scripts):
* module/web/http.scm (web): Adapt users to import the new module.
