Bug#911050: aom: FTBFS - do not like 'kFreeBSD' obj format

[Petter Reinholdtsen <pere@hungry.com>]

Package: aom
Version: 1.0.0-3

The package fail to build on kfreebsd-i386.  This block vlc from
building on kfreebsd-i386.

This is the build error as reported on
<URL: https://buildd.debian.org/status/fetch.php?pkg=aom&arch=kfreebsd-i386&ver=1.0.0-3&stamp=1539463725&raw=0 >:

-- Looking for pthread_create in pthread - found
-- Found Threads: TRUE  
--- aom_configure: Detected CPU: x86
CMake Error at build/cmake/aom_optimization.cmake:103 (message):
  Unknown obj format: kFreeBSD
Call Stack (most recent call first):
  build/cmake/aom_configure.cmake:147 (get_asm_obj_format)
  CMakeLists.txt:77 (include)

-- 
Happy hacking
Petter Reinholdtsen