libzpool: don't include trace.c

It does nothing in userspace anyway.

Reviewed by: Brian Behlendorf <[email protected]>
Reviewed-by: Alexander Motin <[email protected]>
Signed-off-by: Rob Norris <[email protected]>
Sponsored-by: https://despairlabs.com/sponsor/
Closes #16492

Author: robn

lib/libzpool/Makefile.am

@@ -44,7 +44,6 @@ nodist_libzpool_la_SOURCES = \
 	module/lua/lvm.c \
 	module/lua/lzio.c \
 	\
-	module/os/linux/zfs/trace.c \
 	module/os/linux/zfs/vdev_file.c \
 	module/os/linux/zfs/zfs_debug.c \
 	module/os/linux/zfs/zfs_racct.c \