cmake HAVE_VULKAN examples

ZDoom/gzdoom CMakeLists.txt :234 

option (HAVE_VULKAN "Enable Vulkan support" ON)

glKarin/com.n0n3m4.diii4a Q3E/src/main/jni/gzdoom/CMakeLists.txt :257 

option (HAVE_VULKAN "Enable Vulkan support" ON)

flyinghead/flycast CMakeLists.txt :1439 

target_compile_definitions(${PROJECT_NAME} PRIVATE USE_VULKAN HAVE_VULKAN)