multimedia/openh264 crashes FreeBSD 12 on arm64

[Otacílio]

Hello guys

I am compiling some ports on my raspberry pi 3 and some bugs have 
appeared. In the meantime I have found a port that all times when I try 
to compile its raises a kernel panic. This is multimedia/openh264. To 
reproduce, simply turn on the plugins and test options and try to 
compile. The kernel panic happens when it is doing the tests. The 
openh264 port revision I am using is r439777 and freebsd is 12 r317063.

[]'s

-Otacilio