allow packaging use system quazip-qt6

CMakeLists.txt

@@ -78,10 +78,13 @@ else()
     option(YUZU_USE_EXTERNAL_VULKAN_SPIRV_TOOLS "Use SPIRV-Tools from externals" ON)
 endif()
 
+option(YUZU_USE_EXTERNAL_QUAZIP_QT6 "Use quazip-qt6 from externals" ON)
+
 option(YUZU_USE_SYSTEM_OPUS "Use the system Opus library if available" ON)
 
 option(YUZU_USE_SYSTEM_HTTPLIB "Use the system cpp-httplib if available" ON)
 
+
 option(YUZU_USE_QT_MULTIMEDIA "Use QtMultimedia for Camera" OFF)
 
 option(YUZU_USE_QT_WEB_ENGINE "Use QtWebEngine for web applet implementation" OFF)

src/yuzu/CMakeLists.txt

@@ -493,7 +493,12 @@ if (YUZU_ROOM)
 endif()
 
 # Extra deps
+if (YUZU_USE_EXTERNAL_QUAZIP_QT6)
     add_subdirectory(externals)
+else()
+    find_package(QuaZip)
+endif()
+
 target_link_libraries(yuzu PRIVATE QuaZip::QuaZip)
 
 create_target_directory_groups(yuzu)