Build dtksh on more OSs

cde/programs/dtksh/ksh93/src/lib/libast/features/lib

@@ -5,10 +5,10 @@ lib	_cleanup,BSDsetpgrp,atexit,bcopy,bzero,confstr,dirread,dup2,fchmod
 lib	fcntl,fnmatch,fork,fsync,getconf,getdents,getdirentries,getdtablesize
 lib	getgroups,getpagesize,getrlimit,getuniverse,index,killpg,link
 lib	localeconv,lstat,mbtowc,memccpy
-lib	memchr,memcmp,memcpy,memdup,memmove,memset,mkdir,mkfifo,mknod,mktemp
+lib	memchr,memcmp,memcpy,memmove,memset,mkdir,mkfifo,mknod,mktemp
 lib	mount,on_exit,onexit,opendir,pathconf,readlink,remove,rename,rindex
 lib	rmdir,rewinddir,setlocale,setpgid,setpgrp,setpgrp2,setreuid,setsid
-lib	setuid,sigaction,sigprocmask,sigsetmask,sigunblock,sigvec
+lib	setuid,sigaction,sigprocmask,sigsetmask,sigvec
 lib	socketpair,spawnve,spawnveg,strchr,strcoll,strdup,strerror,strrchr
 lib	strtod,strtol,strtoul,strxfrm,symlink,sysconf
 lib	telldir,tmpnam,tzset,universe,unlink,utime,vfork

cde/programs/dtksh/ksh93/src/lib/libast/features/tty

@@ -16,5 +16,7 @@ cat{
 	#else
 	#undef	ioctl
 	#endif
+	#if !defined(linux)
 	extern int		ioctl(int, int, ...);
+	#endif
 }end