packages: Have TNT build on Xcode5 and gcc48

Surprisingly this only shows up on my mac. However the error is
valid. Linux was letting this slide.
Update OSG to 3.2

OSG 3.2 seems to just work on OSX 10.8. Hopefully that applies to all
other systems.
isis: Fix compilation error on OSX and latest clang

hifringe was setting a c-style array's length with a variable. That's
a no-no.