use lowercase "message" to remove recommendation warning (#5196)

It is recommended to use lowercase CMake commands

CMakeLists.txt

@@ -31,7 +31,7 @@ include(CMakeOptions.txt)
 
 if (UNIX AND NOT APPLE AND NOT "${PLATFORM}" MATCHES "DRM" AND NOT "${PLATFORM}" MATCHES "Web")
   if (NOT GLFW_BUILD_WAYLAND AND NOT GLFW_BUILD_X11)
-    MESSAGE(FATAL_ERROR "Cannot disable both Wayland and X11")
+    message(FATAL_ERROR "Cannot disable both Wayland and X11")
   endif()
 endif()
 
@@ -51,7 +51,7 @@ if(NOT TARGET uninstall AND PROJECT_IS_TOP_LEVEL)
 endif()
 
 if (${BUILD_EXAMPLES})
-  MESSAGE(STATUS "Building examples is enabled")
+  message(STATUS "Building examples is enabled")
   add_subdirectory(examples)
 endif()