MFH: r394430

multimedia/openh264: unbreak build on armv6

Disable NEON support for armv6 (softfp). Alas, MACHINE_CPU is
underspecified on arm* to conditionalize NEON check within a port.

PR: 201273
Reported by: pkg-fallout
Submitted by: mikael.urankar@gmail.com
Approved by: ports-secteam (delphij)