Rework unused_imports allow.

Author: smalis-msft

src/lib.rs

@@ -47,7 +47,43 @@
 #![recursion_limit = "500"]
 #![deny(unused)]
 #![allow(unused_macros)]
-#![cfg_attr(not(feature = "default"), allow(unused_imports))]
+#![cfg_attr(
+    not(all(
+        feature = "acct",
+        feature = "aio",
+        feature = "dir",
+        feature = "env",
+        feature = "event",
+        feature = "feature",
+        feature = "fs",
+        feature = "hostname",
+        feature = "inotify",
+        feature = "ioctl",
+        feature = "kmod",
+        feature = "mman",
+        feature = "mount",
+        feature = "mqueue",
+        feature = "net",
+        feature = "personality",
+        feature = "poll",
+        feature = "process",
+        feature = "pthread",
+        feature = "ptrace",
+        feature = "quota",
+        feature = "reboot",
+        feature = "resource",
+        feature = "sched",
+        feature = "socket",
+        feature = "signal",
+        feature = "term",
+        feature = "time",
+        feature = "ucontext",
+        feature = "uio",
+        feature = "user",
+        feature = "zerocopy",
+    )),
+    allow(unused_imports)
+)]
 #![deny(unstable_features)]
 #![deny(missing_copy_implementations)]
 #![deny(missing_debug_implementations)]