Kill WANT_SDL/HAVE_SDL

[AMDmi3]

Summary

WANT_SDL/HAVE_SDL macros allow a port to check which SDL components are installed.

These go against the policy of avoiding automatic dependencies, and there are also no cases in the portstree where it is used properly.

So, remove these knobs.

Test Plan

Tested all affected ports with poudriere

[mat]

Can you add WANT_SDL to bsd.sanity.mk ?

[AMDmi3]

Added WANT_SDL to bsd.sanity.mk

[mat]

Shouldn't some of these ports be switched to USE_SDL ?

Mk/bsd.sanity.mk

157

Maybe add a bit about "if you need SDL, use USE_SDL" or something.

[AMDmi3]

In D4093#85803, @mat wrote:

Shouldn't some of these ports be switched to USE_SDL ?

No. If they use SDL, they already use USE_SDL. WANT_SDL does nothing unless you check for HAVE_SDL. Apart from noegnud*, which checked it for no reason, no port checks HAVE_SDL at all.

[AMDmi3]

Extend message

[mat]

Mk/bsd.sanity.mk

156–158

It should be an error as it's not supported, and I guess it should go in the list below.

[mat]

Mk/bsd.sanity.mk

156–158

Or not, forget about that.