Double precision determination fails.

[GoogleCodeExporter]

VS 2012 issue. osgBullet's CMake does a try_compile for this check, but the 
compile / link fails regardless of being built for double- or single-precision 
Bullet. The root cause of the failure is that VS 2012 doesn't allow mixed usage 
of the C runtime libraries, and apparently previous versions of VS allowed this.

Workaround: go back to Bullet's CMake, set USE_MSVC_RUNTIME_LIBRARY_DLL to ON, 
and rebuild Bullet.

I'm not quite sure how we'd automatically determine whether Bullet was built 
with /MD or /MT, but I'm guessing we could do another try_compile specifically 
for that, then adjust the double precision try_compile to use the appropriate 
version of the runtime libraries.

Original issue reported on code.google.com by [email protected] on 2 Jun 2013 at 8:39