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Fix ndk-gdb to _not_ start the activity unless --start or --launch is used.

Add a new option --delay=<seconds> to change the wait delay between the
launch of an activity and its attachement with gdbserver. The default delay
is also changed from 1 to 2 seconds.

Document the system libraries update.

Change-Id: Ia7e8c47221e3741bdc2688e750dae366c5426e67