[meld] Ignore typing in build_helpers

[Kai Willadsen <kaiw src gnome org>]

commit b5c3878216866605f9979bf38729d49026370c24
Author: Kai Willadsen <kai willadsen gmail com>
Date:   Sun Jan 20 06:11:12 2019 +1000

    Ignore typing in build_helpers
    
    This is mostly distutils interaction, which has very poor hinting.

 setup.cfg | 6 ++++++
 1 file changed, 6 insertions(+)
---
diff --git a/setup.cfg b/setup.cfg
index 8dc0e3b0..de605d0d 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -7,3 +7,9 @@ exclude =
 # Import order check settings
 import-order-style = edited
 application-import-names = meld
+
+
+# build_helpers is almost entirely distutils interactions, which have
+# poor type hinting
+[mypy-meld.build_helpers]
+ignore_errors = True