cmake: fix build with SDL_WAYLAND_SHARED=OFF
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 276c31e..5f3d917 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -482,7 +482,7 @@ endforeach()
set_option(SDL_WAYLAND "Use Wayland video driver" ${UNIX_SYS})
dep_option(SDL_WAYLAND_SHARED "Dynamically load Wayland support" ON "SDL_WAYLAND" OFF)
dep_option(SDL_WAYLAND_LIBDECOR "Use client-side window decorations on Wayland" ON "SDL_WAYLAND" OFF)
-dep_option(SDL_WAYLAND_LIBDECOR_SHARED "Dynamically load libdecor support" ON "SDL_WAYLAND_LIBDECOR" OFF)
+dep_option(SDL_WAYLAND_LIBDECOR_SHARED "Dynamically load libdecor support" ON "SDL_WAYLAND_LIBDECOR;SDL_WAYLAND_SHARED" OFF)
dep_option(SDL_WAYLAND_QT_TOUCH "QtWayland server support for Wayland video driver" ON "SDL_WAYLAND" OFF)
set_option(SDL_RPI "Use Raspberry Pi video driver" ${UNIX_SYS})
set_option(SDL_COCOA "Use Cocoa video driver" ${APPLE})