PHPStan fixes

phpstan/config.neon

@@ -17,9 +17,15 @@ parameters:
         # variable defined in eval
         - '~^Undefined variable: \$res$~'
 
+        # erroneous detection of missing const, see https://github.com/phpstan/phpstan/issues/2960
+        - '~^Access to undefined constant ZipArchive::OPSYS_UNIX.$~'
+
         # we don't have different constructors for parent/child
         - '~^Unsafe usage of new static\(\)\.$~'
 
+        # BC with older PHPUnit
+        - '~^Call to an undefined static method PHPUnit\\Framework\\TestCase::setExpectedException\(\)\.$~'
+
         # hhvm should have support for $this in closures
         -
             count: 1