addressing build failures exposed by GCC-4.7

[Matthias Klose]

A rebuild of the archive using GCC-4.7 shows about ~330 additional build 
failures.  The rebuild was only done for Debian unstable [1], but I don't expect 
many differences compared to precise.  GCC-4.7 will become the default compiler 
for the q-series, so be prepared to address these issues.

Hints how to address the vast majority of these issues can be found at [2].

People helping with these issues should tag the debian report, and attach 
patches until the development cycle of the q-series starts.

   Matthias

[1] http://lists.debian.org/debian-gcc/2012/04/msg00031.html
[2] http://gcc.gnu.org/gcc-4.7/porting_to.html