cleaned up cmakefile

git-svn-id: https://roadrunnerlib.googlecode.com/svn/branches/feature-llvm@1086 c0027639-9190-0b57-01eb-f09a03790dae
clean up LLVM CXX options

git-svn-id: https://roadrunnerlib.googlecode.com/svn/branches/feature-llvm@1087 c0027639-9190-0b57-01eb-f09a03790dae
Merge branch 'gfeature-llvm' of github.com:AndySomogyi/roadrunner into gfeature-llvm