Run gentpl.py with python3

debian/changelog

@@ -9,6 +9,7 @@ grub2 (2.04-2) UNRELEASED; urgency=medium
   * debian/apport/source_grub2.py:
     - Avoid star import.
     - Fix flake8 errors.
+  * Run gentpl.py with python3.
 
  -- Colin Watson <cjwatson@debian.org>  Tue, 09 Jul 2019 15:04:41 +0100
 

debian/control

@@ -5,7 +5,7 @@ Maintainer: GRUB Maintainers <pkg-grub-devel@alioth-lists.debian.net>
 Uploaders: Felix Zielcke <fzielcke@z-51.de>, Jordi Mallach <jordi@debian.org>, Colin Watson <cjwatson@debian.org>, Ian Campbell <ijc@debian.org>, Steve McIntyre <93sam@debian.org>
 Build-Depends: debhelper-compat (= 10),
  patchutils,
- python,
+ python3,
  flex,
  bison,
  po-debconf,

debian/rules

@@ -166,6 +166,7 @@ override_dh_autoreconf:
 		cp -a debian/grub-extras/$$extra debian/grub-extras-enabled/; \
 	done
 	env -u DH_OPTIONS GRUB_CONTRIB=$(CURDIR)/debian/grub-extras-enabled \
+		PYTHON=python3 \
 		dh_autoreconf -- ./autogen.sh
 
 debian/stamps/configure-grub-common: debian/stamps/configure-grub-$(COMMON_PLATFORM)