This update for libvpx fixes the following issues:

- CVE-2019-2126: Fixed a double free in ParseContentEncodingEntry() (bsc#1160611).
- CVE-2019-9325: Fixed an out-of-bounds read (bsc#1160612).
- CVE-2019-9232: Fixed an out-of-bounds memory access on fuzzed data (bsc#1160613).
- CVE-2019-9433: Fixed a use-after-free in vp8_deblock() (bsc#1160614).
- CVE-2019-9371: Fixed a resource exhaustion after memory leak (bsc#1160615).