Disable docs due to issues with auto-generated API docs

--- lldb/CMakeLists.txt.orig
+++ lldb/CMakeLists.txt
@@ -73,7 +73,6 @@
 
 add_subdirectory(source)
 add_subdirectory(tools)
-add_subdirectory(docs)
 
 if (LLDB_ENABLE_PYTHON)
   if(LLDB_BUILD_FRAMEWORK)