build(deps): fix use of libdrm headers when DRM capture is disabled

Signed-off-by: James Le Cuirot <chewi@gentoo.org>

Author: chewi

cmake/compile_definitions/linux.cmake

@@ -80,16 +80,17 @@ if(CUDA_FOUND)
     add_compile_definitions(SUNSHINE_BUILD_CUDA)
 endif()
 
-# libdrm is required for DRM (KMS), KWin ScreenCast and Wayland
-if(${SUNSHINE_ENABLE_DRM} OR ${SUNSHINE_ENABLE_KWIN} OR ${SUNSHINE_ENABLE_WAYLAND})
+# libdrm is required for DRM (KMS). Only the headers are required for Wayland,
+# Vulkan, and PipeWire (KWin, Portal).
+if(${SUNSHINE_ENABLE_DRM} OR ${SUNSHINE_ENABLE_WAYLAND} OR ${SUNSHINE_ENABLE_VULKAN} OR ${SUNSHINE_ENABLE_KWIN} OR ${SUNSHINE_ENABLE_PORTAL})
     find_package(LIBDRM REQUIRED)
 else()
     set(LIBDRM_FOUND OFF)
 endif()
 if(LIBDRM_FOUND)
     include_directories(SYSTEM ${LIBDRM_INCLUDE_DIRS})
-    list(APPEND PLATFORM_LIBRARIES ${LIBDRM_LIBRARIES})
     if(${SUNSHINE_ENABLE_DRM})
+        list(APPEND PLATFORM_LIBRARIES ${LIBDRM_LIBRARIES})
         add_compile_definitions(SUNSHINE_BUILD_DRM)
         list(APPEND PLATFORM_TARGET_FILES
                 "${CMAKE_SOURCE_DIR}/src/platform/linux/kmsgrab.cpp")