CMake: display warning when building without Wayland on systems that support Wayland

CMakeLists.txt

@@ -44,7 +44,7 @@ if(SUPPORTS_X11)
   option(USE_X11 "Support X11 window system" ON)
 endif()
 if(SUPPORTS_WAYLAND)
-  option(USE_WAYLAND "Support Wayland window system" OFF)
+  option(USE_WAYLAND "Support Wayland window system" ON)
 endif()
 if((LINUX OR FREEBSD) OR ANDROID)
   option(USE_EGL "Support EGL OpenGL context creation" ON)

src/common/CMakeLists.txt

@@ -125,6 +125,8 @@ endif()
 
 if(USE_WAYLAND)
   target_compile_definitions(common PRIVATE "-DUSE_WAYLAND=1")
+elseif(SUPPORTS_WAYLAND)
+  message(WARNING "Wayland support for renderers is disabled.\nDuckStation will FAIL to start on Wayland.")
 endif()
 
 if(USE_DRMKMS)