By Kai Germaschewski.

This patch adds a -DKBUILD_MODNAME to the kernel compile, which
contains the base of the module name which is being built.

 - Some sreorganization of the c_flags since they're needed for
   generating modversions (.ver) and compiling
 - Use the right KBUILD_MODNAME also when the user just wants a .i/.s/.lst
   file for debugging and also when generating modversions
 - It looks like with your current approach you can't have a ',' or '-' in
   KBUILD_MODNAME - however, that means that KBUILD_MODNAME is not quite
   right for passing module parameters for built-in modules on the command
   line, it would be confusing to pass parameters for ide-cd as
   ide_cd.foo=whatever. So that part could use a little more thought.
 - If you think your module_names trick makes a noticable difference, feel
   free to re-add it.
 - It's possible that objects are linked into more than one module - I
   suppose this shouldn't be a problem, since these objects hopefully
   don't have a module_init() nor do they export symbols. Not sure if your
   patch did handle this.