Enable cap_rights_t test on non-Capsicum platforms.

We don't actually need to compile this stuff: we're just testing the
interpretation of annotations.  That said, do conditionally compile things
when we're on a Capsicum-supporting platform (ahem) to give the compiler a
chance to complain about our use of the primitives.
Merge branch 'master' of github.com:CTSRD-SOAAP/soaap
Fix soaap tool so that it uses LLVM's updated API