Exclude docs/analyzer/ from the default Sphinx build.

This paves the way for converting the analyzer docs to Sphinx (by
setting up a nested Sphinx tree in this directory).

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@171424 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed