[Jaunty] SRU-RFC Backport two compile flag changes from upstream

[Stefan Bader]

[no tracking bug currently]

SRU Justification:

Impact: There have been two changes to the compiler flags which where also 
pulled down to the stable trees which I would like to pull back for Jaunty as 
well. The first one replaces '-fwrapv' with '-fno-strict-overflow' which is 
supposed to produce less intrusive code (while Jaunty does not suffer from the 
buggy gcc 4.1.x as it uses 4.3.3).
The second option prevents NULL pointer checks from being optimized away.

Fix: Taking the following two patches from upstream/stable.

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