Add 'debug-threads' suboption to --name

Add flag storage to qemu-thread-* to store the namethreads flag

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>

util/qemu-thread-posix.c

@@ -27,6 +27,13 @@
 #include "qemu/thread.h"
 #include "qemu/atomic.h"
 
+static bool name_threads;
+
+void qemu_thread_naming(bool enable)
+{
+    name_threads = enable;
+}
+
 static void error_exit(int err, const char *msg)
 {
     fprintf(stderr, "qemu: %s: %s\n", msg, strerror(err));