Effecively disabled the code that waits for serial device re-enumeration

See http://stm32duino.com/viewtopic.php?f=35&t=1251

tools/linux/stlink_upload

@@ -1,4 +1,8 @@
 #!/bin/bash
+$(dirname $0)/stlink/st-flash write "$4" 0x8000000
+exit 0
+
+## Remove the lines 2 and 3 (above) if you want this script to wait until the Serial device has been enumerated and loaded before the script exits
 
 # Check for leaf device.
 function leaf_status()