multimedia/simplescreenrecorder: Update to 0.3.9

The update also includes:

• Change to Qt5
• Disabling of GLinject feature that doesn't work on FreeBSD
• Switching build to cmake

Tests showed that it works as expected.

Submitted by: myself
Reported by: portscout
Approved by: adamw (mentor)
Differential Revision: https://reviews.freebsd.org/D13787