[PATCH] Link libraries by default with -as-needed flag.

[Andreas Schneider]

With this flag, the linker checks if the needed symbols are provided by
the library. If you add a library and no function is used from it, the 
linker skips it. This requires a correct linking order, see            

http://blog.cynapses.org/2009/08/24/undefined-reference-to-function/

The as-needed flag is set in several distributions by default now.
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