build: fix tox environment creation with the latest updates

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 envlist = check, tests
-isolated_build = True
+isolated_build = true
 labels =
 	release = version, docs, publish
 dependencies = -e .[journald,pacman,s3,shell,stats,validator,web]
@@ -27,7 +27,9 @@ description = Run common checks like linter, mypy, etc
 deps =
 	{[tox]dependencies}
 	-e .[check]
+pip_pre = true
 setenv =
+	CFLAGS="-Wno-unterminated-string-initialization"
 	MYPYPATH=src
 commands =
 	autopep8 --exit-code --max-line-length 120 -aa -i -j 0 -r "src/{[tox]project_name}" "tests/{[tox]project_name}"
@@ -65,7 +67,7 @@ description = Generate html documentation
 deps =
 	{[tox]dependencies}
 	-e .[docs]
-recreate = True
+recreate = true
 commands =
 	sphinx-build -b html -a -j auto -W docs {envtmpdir}{/}html
 
@@ -89,6 +91,7 @@ description = Run tests
 deps =
 	{[tox]dependencies}
 	-e .[tests]
+pip_pre = true
 commands =
 	pytest {posargs}