multimedia/bsdbktr_tvtune: Mark DEPRECATED

- Requires defunct bktr driver which will no longer be available
  after the EOL of 12
- Set EXPIRATION_DATE to 2023-12-31 the same for the EOL of 12

Approved by:	portmgr (blanket)

multimedia/bsdbktr_tvtune/Makefile

@@ -9,6 +9,8 @@ WWW=		https://web.archive.org/web/20050207003754/http://topfx.com/dist/bsdbktr_t
 
 LICENSE=	NONE
 
+DEPRECATED=	Requires defunct bktr
+EXPIRATION_DATE=2023-12-31
 .if !exists(/usr/include/dev/bktr/ioctl_bt848.h)
 IGNORE=		needs bktr(4) which is no longer available on your FreeBSD version
 .endif