Remove unused #include.

Bug: N/A
Test: builds
Change-Id: I792bfdb38672f7a51991c19a9838dd12500036c7
diff --git a/adb/sysdeps.h b/adb/sysdeps.h
index f1197d7..f2911e0 100644
--- a/adb/sysdeps.h
+++ b/adb/sysdeps.h
@@ -314,7 +314,6 @@
 #else /* !_WIN32 a.k.a. Unix */
 
 #include <cutils/sockets.h>
-#include <cutils/threads.h>
 #include <fcntl.h>
 #include <poll.h>
 #include <signal.h>