misc/chatgpt-shell-cli: Add nox11 flavor

Add nox11 flavor, so that it can be installed/used on headless servers.

PR:		271880
Reported by:	olgeni

misc/chatgpt-shell-cli/Makefile

@@ -15,7 +15,12 @@ RUN_DEPENDS=	bash:shells/bash \
 		jq:textproc/jq \
 		xdg-open:devel/xdg-utils
 
-USES=		magick:run shebangfix
+FLAVORS=	x11 nox11
+FLAVOR?=	${FLAVORS:[1]}
+
+nox11_PKGNAMESUFFIX=	-nox11
+
+USES=		magick:${FLAVOR},run shebangfix
 
 USE_GITHUB=	yes
 GH_ACCOUNT=	0xacx