packages/ffmpeg: revert vulkan change
packages/ffmpeg: revert vulkan change

Can't get it to work:
libpthread.a(libwinpthread_la-cond.o):cond.c:(.text+0x4b0): multiple definition of `pthread_cond_init'; libvulkan-1.dll.a(d000409.o):(.text+0x0): first defined here

Will need more fiddling..  no clue why it says vulkan defines pthread functions .. it doesn't

DeadSix27/python_cross_compile_script