x11/libX11: Fix CVE-2020-14347
Add upstream patches to x11/libX11 to fix Heap corruption in the X input
method client in libX11.
Announcement:
https://lists.x.org/archives/xorg-announce/2020-July/003050.html
PR: 248409 (based on)
Submitted by: VVD
MFH: 2020Q3 (implicit, security update)
Security: 6faa7feb-d3fa-11ea-9aba-0c9d925bbbc0