Fix bare 'except:' to placate errors in new flake8 version.

- fixes E722 errors from latest version of flake8
- requires us to not use 'bare except:' and catch BaseException instead

var/spack/repos/builtin/packages/hdf5/package.py

@@ -270,7 +270,7 @@ def check_install(self):
             try:
                 check = Executable('./check')
                 output = check(output=str)
-            except:
+            except ProcessError:
                 output = ""
             success = output == expected
             if not success: