libuutil: remove the whole thing

Sponsored-by: https://despairlabs.com/sponsor/
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Rob Norris <robn@despairlabs.com>
Closes #17934

cmd/zpool/Makefile.am

@@ -28,7 +28,6 @@ zpool_LDADD = \
 	libzfs.la \
 	libzfs_core.la \
 	libnvpair.la \
-	libuutil.la \
 	libzutil.la
 
 zpool_LDADD += $(LTLIBINTL)

cmd/zpool/zpool_main.c

@@ -46,7 +46,6 @@
 #include <inttypes.h>
 #include <libgen.h>
 #include <libintl.h>
-#include <libuutil.h>
 #include <locale.h>
 #include <pthread.h>
 #include <stdio.h>