debian/rules: reduce log spam from asn1 target

There are 3694 warnings for one of the following two messages:

   UserWarning: The same field names for different types. Explicit field renaming is recommended.
   UserWarning: The same type names for different types. Explicit type renaming is recommended.

Both warnings are accompanied by some context. Since the packager is
unlikely going to address these issues, and CI systems struggle with the
size of the generated logs, disable this subset of warnings. The output
of `ninja asn1` shrinks from 28191 lines (2.4MiB) to 483 lines (32KiB).

Change-Id: I44e9e1ab40f2255136fb1440e3bde2ccc9e55295
Reviewed-on: https://code.wireshark.org/review/34098
Petri-Dish: Peter Wu <[email protected]>
Tested-by: Petri Dish Buildbot
Reviewed-by: Balint Reczey <[email protected]>

Author: Lekensteyn

debian/rules

@@ -27,6 +27,8 @@ override_dh_auto_configure:
 	dh_auto_configure -- -DBUILD_xxx2deb=ON
 
 override_dh_auto_build:
+	# Ignore warnings from asn2wrs.py about duplicate field names.
+	PYTHONWARNINGS='ignore:The same:UserWarning::0' \
 	$(MAKE) -C $(CURDIR)/obj-* asn1
 	dh_auto_build
 	$(MAKE) -C $(CURDIR)/obj-* user_guide_html developer_guide_html