- Make 'flags' argument to chflags(2), fchflags(2) and lchflags(2) of type

- Make 'flags' argument to chflags(2), fchflags(2) and lchflags(2) of type
  u_long. Before this change it was of type int for syscalls, but prototypes
  in sys/stat.h and documentation for chflags(2) and fchflags(2) (but not
  for lchflags(2)) stated that it was u_long. Now some related functions
  use u_long type for flags (strtofflags(3), fflagstostr(3)).
- Make path argument of type 'const char *' for consistency.

Discussed on:	arch
Sponsored by:	The FreeBSD Foundation