[PATCH] tests: Explicitly unset DEBUGINFOD_URLS.

[Mark Wielaard]

On Fri, 2020-02-21 at 13:49 +0100, Mark Wielaard wrote:
> If DEBUGINFOD_URLS is set various tests will try to query the debuginfod
> server which can stall the tests a bit. If other evironment variables
> like DEBUGINFOD_PROGRESS are set it will make various tests fail because
> the expected output doesn't match. Tests should PASS without needing a
> debuginfod server, unless they test (and set) one themselves.

Pushed to master.