shadow: update to 4.8.1

Fixed license information.

Removed patch requiring autoreconf and replaced with a configure variable.

Removed faulty patch that broke systems without a disabled crypt size hack.
Replaced with using a SED command as well as bcrypt, which works in musl.

Removed su patch and converted it to a SED command in the Makefile.

Added new shadow utilities.

Signed-off-by: Rosen Penev <rosenp@gmail.com>
(cherry picked from commit 87e5ded04c)

utils/shadow/patches/004-fix-su-controoling-term.patch

@@ -1,6 +1,6 @@
 --- a/src/su.c
 +++ b/src/su.c
-@@ -1127,8 +1127,12 @@ int main (int argc, char **argv)
+@@ -1122,8 +1122,12 @@ int main (int argc, char **argv)
  
  		if (fd >= 0) {
  			err = ioctl (fd, TIOCNOTTY, (char *) 0);