set C standard to 11 for Vulkan backend 2

crates/memonitor-sys/vulkan/CMakeLists.txt

@@ -1,5 +1,8 @@
 cmake_minimum_required(VERSION 3.5)
 
+set(CMAKE_C_STANDARD 11)
+set(CMAKE_C_STANDARD_REQUIRED true)
+
 project(memonitor-vk LANGUAGES C)
 
 set(VULKAN_HEADERS_INSTALL_DIR "${CMAKE_CURRENT_SOURCE_DIR}/thirdparty/Vulkan-Headers")
@@ -10,7 +13,6 @@ option(MEMONITOR_VALIDATE "Use Vulkan validation layers" OFF)
 add_library(memonitor-vk STATIC "include/memonitor.h" "src/memonitor.c")
 target_include_directories(memonitor-vk PUBLIC "include")
 target_link_libraries(memonitor-vk PRIVATE volk)
-set_property(TARGET memonitor-vk PROPERTY C_STANDARD 11)
 
 if (MEMONITOR_VALIDATE)
     target_compile_definitions(memonitor-vk PUBLIC USE_VALIDATION_LAYERS)