. the IDCT functions are now located in modules : the classic IDCT,
   our optimized IDCT, and MMX IDCT.
 . cosmetic changes for modules (pf_* instead of p_*)
 . fixes to the BeOS and dummy modules

   WARNING: a new directory has been added, which means you have to
   use `cvs update -dP' to update ; files have been removed , which means
   you either have to run `make distclean' or remove the .deps directory,
   and the configure script has changed, which means you have to run it
   again. Don't complain before having checked this :)

   Note about the IDCT modules: there is no way to choose the one we
   use, but you may remove the module in lib/ to prevent it from being
   loaded. The preference order is : MMX, Optimized, Classic.