[mythtv] Attn: Packagers: the VERSION file has been renamed to SRC_VERSION

[Scott Theisen]

This was changed in 
https://github.com/MythTV/mythtv/commit/1e84e2b39d5b31e488731eb38b81b79f6f178ace 
, which applied to v32 (master at that time) and was back-ported to 
v31/fixes 
https://github.com/MythTV/mythtv/commit/3162473370b31c749e8417b1b19fe6dc2186cb95 
.

This was mentioned at the time on the mailing list, but only in 
reference to fixing compilation on macOS.

Regards,

Scott