0acf08d985
have been in the base for a while, so the gymnastics here aren't needed. In addition, the bugs in subr_disk.c have been fixed since 2009, so there's no need for an identical copy of it in the tree anymore. There's really no need to binary patch g_io_request, so let's get rid of the code (not compiled in anymore) lest others think it is a good idea.