In dladdr_find_symbol prefer a global symbol over a weak version

Change-Id: Ic90b738acb41fc4c8253f594a178958fff4809dc
[MC] Pass user context to akim signal callback handler

libakim reuires the user context to implement full signal handling

Change-Id: I79ec8528e7f125ddaaf299481c108a3967269e27
[MC] Support load_bias!=base and dynamic exec files

Drop error message when load_bias != base.

Avoid searching ARM main exec file's as-yet-unread symbol
table when loading libakim.so.

Also includes patch:
Handle unused parameter in debuggerd_signal_handler.

Change-Id: Ia78e17cd7fc98dcc03568a76922b01ec662bf86b