llvm3[345]: fix path in caveats
llvm3[345]: bottle against system python
llvm3[345]: use absolute dylib IDs
llvm33: update 3.3_1 bottle.
llvm34: update 3.4.2 bottle.
llvm35: update 3.5.0 bottle.
gcc48: remove outdated bottle checksums

These bottles were added for 4.8.2 and are no longer valid.
gcc48 4.8.4
gcc48: sandbox within series release number only
gcc48: add 4.8.4 bottle.