- Implement svr4_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_msgctl(), kern_execve(),
  kern_mkfifo(), kern_mknod(), kern_statfs(), kern_fstatfs(),
  kern_setitimer(), kern_stat(), kern_lstat(), kern_fstat(), kern_utimes(),
  kern_pathconf(), and kern_unlink().

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