Bug#728521: ogre-1.9 / gcc-4.8

[Rebecca N. Palmer]

Control: severity 728521 normal
Control: merge 725143 728521

It's now official that gcc 4.8 will be required in jessie [1], so this 
is now not an RC (and could even be closed altogether, though that isn't 
my decision to make; the current non-working attempts to select gcc-4.8 
are ugly, but harmless wherever 4.8+ is the default).

s390x are currently switching to 4.8 [2], so another try once they have 
should fix the "out of date on s390x" testing blocker.

[1] http://lists.debian.org/debian-devel-announce/2013/11/msg00007.html
[2] http://lists.debian.org/debian-devel/2013/11/msg00449.html