Set WITH_SDL in parent scope so xpdevplus can pick it up.

14 jobs for master in 12 minutes and 35 seconds (queued for 19 seconds)
Status Job ID Name Coverage
  Build
passed #31944
FreeBSD
jsdoor-freebsd

00:04:00

passed #31945
Linux
jsdoor-linux

00:06:59

passed #31947
FreeBSD
jsdoor-windows

00:01:56

passed #31939
FreeBSD
sbbs-freebsd

00:05:32

passed #31934
Linux
sbbs-linux

00:11:30

passed #31937
Windows
sbbs-windows

00:06:17

passed #31946
FreeBSD
sexpots-freebsd

00:00:09

passed #31935
Linux
sexpots-linux

00:00:16

passed #31938
Windows
sexpots-windows

00:00:32

passed #31942
FreeBSD
syncdraw-freebsd

00:00:21

passed #31943
Linux
syncdraw-linux

00:01:02

passed #31940
FreeBSD
syncterm-freebsd

00:01:01

passed #31936
Linux
syncterm-linux

00:03:18

passed #31941
FreeBSD
syncterm-windows

00:01:43