qt: make qt dependencies a feature in vcpkg

so they are not included if building non-qt

CMakeLists.txt

@@ -18,6 +18,10 @@ cmake_minimum_required(VERSION 3.16)
 cmake_policy(SET CMP0091 NEW)
 cmake_policy(SET CMP0079 NEW)
 
+if (QT)
+    list(APPEND VCPKG_MANIFEST_FEATURES "qt-ui")
+endif()
+
 project(86Box
     VERSION 3.2
     DESCRIPTION "Emulator of x86-based systems"

vcpkg.json

@@ -3,14 +3,21 @@
 	"version-string": "3.1",
 	"homepage": "https://86box.net/",
 	"documentation": "http://86box.readthedocs.io/",
-	"license": "GPL-2.0-only",
+	"license": "GPL-2.0-or-later",
 	"dependencies": [
 		"freetype",
 		"libpng",
 		"openal-soft",
 		"sdl2",
-		"rtmidi",
+		"rtmidi"
+	],
+	"features": {
+		"qt-ui": {
+			"description": "Qt User Interface",
+			"dependencies": [
 				"qt5-base",
 				"qt5-translations"
 			]
+		}
+	}
 }