Move transport declarations into transport.h.

There are a few cloexec issues in here as an added bonus.

Change-Id: I1699d719d733f47878bdba0454230cf5ab6a60b6
diff --git a/adb/usb_linux.c b/adb/usb_linux.c
index d242c8a..d03f8be 100644
--- a/adb/usb_linux.c
+++ b/adb/usb_linux.c
@@ -14,33 +14,30 @@
  * limitations under the License.
  */
 
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <string.h>
-
-#include <sys/ioctl.h>
-#include <sys/types.h>
-#include <sys/time.h>
-#include <dirent.h>
-#include <fcntl.h>
-#include <errno.h>
 #include <ctype.h>
-
+#include <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
 #include <linux/usbdevice_fs.h>
 #include <linux/version.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <unistd.h>
 #if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 20)
 #include <linux/usb/ch9.h>
 #else
 #include <linux/usb_ch9.h>
 #endif
-#include <asm/byteorder.h>
 
 #include "sysdeps.h"
 
 #define   TRACE_TAG  TRACE_USB
 #include "adb.h"
-
+#include "transport.h"
 
 /* usb scan debugging is waaaay too verbose */
 #define DBGX(x...)