[FFmpeg-devel] [PATCH v2] hwcontext_vulkan: make 2 public functions always available

[Lynne]

The issue is that if ffmpeg is compiled without Vulkan, and an API 
user includes and uses the functions exposed in hwcontext_vulkan.h,
then a linking error will happen, as the hwcontext_vulkan.c file has
not been compiled.

Move the functions to another file, and make it always compiled. The
functions do not use any Vulkan functions.

Patch attached.


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