[LNT] Python 3 support: Fix except with named exception

Use Python 3 syntax for except statement with named exception. This was
produced by running futurize's stage1 lib2to3.fixes.fix_except.

Reviewers: cmatthews, hubert.reinterpretcast, kristof.beyls

Reviewed By: hubert.reinterpretcast

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D67807

llvm-svn: 372472

Author: Thomas Preud'homme

lnt/tests/compile.py

@@ -314,7 +314,7 @@ def test_build(base_name, run_info, variables, project, build_config, num_jobs,
         # Remove any existing content, if necessary.
         try:
             shutil.rmtree(source_path)
-        except OSError, e:
+        except OSError as e:
             if e.errno != errno.ENOENT:
                 raise