* lang_clang/analyze/graph_code_clang.ml: better dupe diagnostic, filter
error in EXTERNAL, refactoring to current_clang2_file
* lang_clang/analyze/location_clang.ml: comments
* lang_clang/analyze/location_clang.ml: use ExpansionLoc so can comment
stuff
* lang_clang/analyze/graph_code_clang.ml: _Bool hardcoded
* lang_clang/analyze/clang.patch: use ExpansionLoc
* lang_clang/analyze/graph_code_clang.ml: