- Implement ibcs2_emul_find() using kern_alternate_path(). This changes

  the semantics in that the returned filename to use is now a kernel
  pointer rather than a user space pointer.  This required changing the
  arguments to the CHECKALT*() macros some and changing the various system
  calls that used pathnames to use the kern_foo() functions that can accept
  kernel space filename pointers instead of calling the system call
  directly.
- Use kern_open(), kern_access(), kern_execve(), kern_mkfifo(), kern_mknod(),
  kern_setitimer(), kern_getrusage(), kern_utimes(), kern_unlink(),
  kern_chdir(), kern_chmod(), kern_chown(), kern_symlink(), kern_readlink(),
  kern_select(), kern_statfs(), kern_fstatfs(), kern_stat(), kern_lstat(),
  kern_fstat().
- Drop the unused 'uap' argument from spx_open().
- Replace a stale duplication of vn_access() in xenix_access() lacking
  recent additions such as MAC checks, etc. with a call to kern_access().

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