fatal error: va/va_dec_av1.h: No such file or directory

[uartie]

Software that includes installed va/va.h can't compile: va/va.h:4630:10: fatal error: va/va_dec_av1.h: No such file or directory. Did you forget to add an install target for va_dec_av1.h for the automake toolchain?

This issue was introduced with #317