patch 8.2.0391: CI test coverage dropped Commit: https://github.com/vim/vim/commit/b2e1f8a28fab71c7ef38d39226967be8c3559590 Author: Bram Moolenaar <Bram@vim.org> Date: Mon Mar 16 12:09:30 2020 +0100 patch 8.2.0391: CI test coverage dropped Problem: CI test coverage dropped. Solution: Set $DISPLAY also for non-GUI builds. (James McCoy, closes https://github.com/vim/vim/issues/5788)

#
# Common Makefile, defines the list of tests to run and other things.
#

# Argument for running ctags.
TAGS_FILES = \
	*.c \
	*.cpp \
	*.h \
	auto/*.c \
	libvterm/src/*.c \
	libvterm/src/*.h \
	libvterm/include/*.h \
	xdiff/*.c \
	xdiff/*.h