MFH: r424401

Add patch to disable optimizations on a keyboard input function
when using the clang compiler. This allows removing the requirement
on gcc.

Patch based on suggestion from Ivan <bsd@abinet.ru>.

Bug has been reported upstream.

PR: 213595
Submitted by: Michael Danilov <mike.d.ft402@gmail.com>

Approved by: ports-secteam (feld)