[3.12] main/xen: fix several XSAs (CVEs)
- CVE-2020-29480 XSA-115
- CVE-2020-29481 XSA-322
- CVE-2020-29482 XSA-323
- CVE-2020-29484 XSA-324
- CVE-2020-29483 XSA-325
- CVE-2020-29485 XSA-330
- CVE-2020-29566 XSA-348
- CVE-2020-29486 XSA-352
- CVE-2020-29479 XSA-353
- CVE-2020-29570 XSA-358
- CVE-2020-29571 XSA-359
Edited by Henrik Riomar