ANSIify.  Same binary code is produced for GENERIC.MP + KGDB + DDB.
disable genfs readahead.
add simple readahead routines.
unwrap a short line.
add a readahead context argument to VOP_READ.
regen.
- setup/cleanup readahead context.
- adapt to the new VOP_READ prototype.
adapt ffs, lfs, nfs.
add uvm_readahead.c.
remove subr_vmem.c, which was added mistakenly.
adapt vnd.
add a pointer to read ahead context to struct file.
add sys_posix_fadvise.
regen.
add posix_fadvise.
- adapt to the new prototype of VOP_READ.
- adapt ext2fs and union.
add missing include.
adapt the rest of filesystems which use genfs_getpages.
- #ifdef out debug printf.
- an assertion.
fix a reversed condition in the previous.