Bug 1526062 - Add missing imports for Exception. r=nalexander

Depends on D19109

Differential Revision: https://phabricator.services.mozilla.com/D19110

--HG--
extra : moz-landing-system : lando

build/moz.configure/toolchain.configure

@@ -442,6 +442,7 @@ def try_preprocess(compiler, language, source):
 @imports(_from='mozbuild.configure.constants',
          _import='OS_preprocessor_checks')
 @imports(_from='textwrap', _import='dedent')
+@imports(_from='__builtin__', _import='Exception')
 def get_compiler_info(compiler, language):
     '''Returns information about the given `compiler` (command line in the
     form of a list or tuple), in the given `language`.

build/moz.configure/windows.configure

@@ -97,6 +97,7 @@ def valid_windows_sdk_dir_result(value):
 @depends(c_compiler, windows_sdk_dir, valid_windows_version, 'WINDOWSSDKDIR')
 @checking('for Windows SDK', valid_windows_sdk_dir_result)
 @imports(_from='__builtin__', _import='sorted')
+@imports(_from='__builtin__', _import='Exception')
 @imports(_from='textwrap', _import='dedent')
 def valid_windows_sdk_dir(compiler, windows_sdk_dir, target_version,
                           windows_sdk_dir_env):