[OE-core] [PATCH v2 1/3] qemu: Upgrade to version 4.1

[Ross Burton]

I think this series is responsible for testimage failing on qemumips:

WARNING: core-image-sato-sdk-1.0-r0 do_testimage: Couldn't login into 
serial console as root using blank password
WARNING: core-image-sato-sdk-1.0-r0 do_testimage: The output:
root
7
<<< run_serial(): command timed out after 60 seconds without output >>>

Ross