memory leak when destroying guest without PT devices [XSA-207] (#1422492)
update patches for XSA-208 after upstream revision (no functional change)

—-

Qemu: net: mcf_fec: infinite loop while receiving data in mcf_fec_receive
[CVE-2016-9776]
Qemu: audio: memory leakage in ac97 [CVE-2017-5525] (#1414111)
Qemu: audio: memory leakage in es1370 device [CVE-2017-5526] (#1414211)
oob access in cirrus bitblt copy [XSA-208, CVE-2017-2615] (#1418243)