preprocessor: Update mkdeps for modules

[Nathan Sidwell]

This is	slightly different to the original patch I posted.  This adds
separate module target and dependency functions (rather than a single
bi-modal function).

         libcpp/
         * include/cpplib.h (struct cpp_options): Add modules to
         dep-options.
         * include/mkdeps.h (deps_add_module_target): Declare.
         (deps_add_module_dep): Declare.
         * mkdes.c (class mkdeps): Add modules, module_name, cmi_name,
         is_header_unit fields.  Adjust cdtors.
         (deps_add_module_target, deps_add_module_dep): New.
         (make_write): Write module dependencies, if enabled.

pushing to trunk

-- 
Nathan Sidwell
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