- Add a custom version of exec_copyin_args() to deal with the 32-bit   pointers in argv and envv in userland and use that together with   kern_execve() and exec_free_args() to implement freebsd32_execve()   without using the stackgap. - Fix freebsd32_adjtime() to call adjtime() rather than utimes().  Still   uses stackgap for now. - Use kern_setitimer(), kern_getitimer(), kern_select(), kern_utimes(),   kern_statfs(), kern_fstatfs(), kern_fhstatfs(), kern_stat(),   kern_fstat(), and kern_lstat().
- Add a custom version of exec_copyin_args() to deal with the 32-bit
  pointers in argv and envv in userland and use that together with
  kern_execve() and exec_free_args() to implement freebsd32_execve()
  without using the stackgap.
- Fix freebsd32_adjtime() to call adjtime() rather than utimes().  Still
  uses stackgap for now.
- Use kern_setitimer(), kern_getitimer(), kern_select(), kern_utimes(),
  kern_statfs(), kern_fstatfs(), kern_fhstatfs(), kern_stat(),
  kern_fstat(), and kern_lstat().

Tested by:	cokane (amd64)
Silence on:	amd64, ia64

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