* include/sys/wait.h (__waitpid): Add libc_hidden_proto.

* include/sys/wait.h (__waitpid): Add libc_hidden_proto.

	* sysdeps/unix/sysv/sco3.2.4/waitpid.S: Add libc_hidden_def.
	* sysdeps/unix/sysv/sysv4/waitpid.c: Add libc_hidden_weak.
	* sysdeps/unix/sysv/linux/waitpid.c: Likewise.
	* sysdeps/unix/sysv/aix/waitpid.c: Likewise.
	* sysdeps/unix/bsd/bsd4.4/waitpid.c: Likewise.
	* sysdeps/generic/waitpid.c: Likewise.

	* include/net/if.h: New file.  Use libc_hidden_proto
	for if_nametoindex and if_indextoname.
	* sysdeps/generic/if_index.c: Add libc_hidden_def.
	* sysdeps/mach/hurd/if_index.c: Likewise.
	* sysdeps/unix/sysv/linux/if_index.c: Likewise.

	* include/grp.h (setgroups): Add libc_hidden_proto.
	* sysdeps/generic/setgroups.c: Add libc_hidden_def.
	* sysdeps/mach/hurd/setgroups.c: Likewise.
	* sysdeps/unix/sysv/irix4/setgroups.c: Likewise.
	* sysdeps/unix/sysv/linux/i386/setgroups.c: Likewise.