Replace USE_GHOSTSCRIPT with USES=ghostscript

[kwm]

Summary

First draft of new ghostscript.mk USES. Only included the bare minimum to
not spam this review with all the USE_GHOSTSCRIPT changes. Would like
feedback on the ghostscript.mk content before proceeding with converting
the ports tree, and submitting that for exp-run.

Test Plan

tested with print/libspecter with different arguments.

[bapt]

At first glance it looks good, but that means all the ports using USE_GHOSTSCRIPT should also be converted and a course this will have to go though a couple of exp-runs :)

[antoine]

Mk/Uses/ghostscript.mk

35 ↗

(On Diff #6534)

IIRC bsd.port.mk already does the S/,/ /g

print/libspectre/Makefile

7 ↗

(On Diff #6534)

why bump?

[kwm]

Update

Unbump libspecter no revision bump needed.
Add bsd.sanity.mk lines about USE_GHOSTSCRIPT
Add check to check if GHOSTSCRIPT_DEFAULT is a valid value
bsd.port.mk already does _ARGS:S/,/ / so we don't have to.

[kwm]

And I forgot to include CHANGES, will be back in the next update.

[mat]

Mk/Uses/ghostscript.mk

59 ↗

(On Diff #6541)

maybe add the invalid value in the IGNORE message, like ... value: ${GHOSTSCRIPT_DEFAULT}, please ...

[kwm]

Small update

Report the actualy incorrect GHOSTSCRIPT_DEFAULT value in the error message
Add CHANGES again.

[kwm]

Add antoine@'s suggestion add back WITHOUT_X11 processing.

I tried to write some code to check if OPTIONS_DEFINE=X11 was set and
honoring PORT_OPTIONS:MX11 but I couldn't get that working.

Either we leave it like this or I'm open for suggestions on how to impliment
that.

[kwm]

Drop drupal.mk uses.
Chase ports updates.