chore: move nv-codec-headers to build-deps submodule (#5449)

.gitmodules

@@ -29,10 +29,6 @@
 	path = third-party/moonlight-common-c
 	url = https://github.com/moonlight-stream/moonlight-common-c.git
 	branch = master
-[submodule "third-party/nv-codec-headers"]
-	path = third-party/nv-codec-headers
-	url = https://github.com/FFmpeg/nv-codec-headers.git
-	branch = master
 [submodule "third-party/nvapi"]
 	path = third-party/nvapi
 	url = https://github.com/NVIDIA/nvapi.git

cmake/compile_definitions/common.cmake

@@ -59,7 +59,10 @@ elseif(UNIX)
     endif()
 endif()
 
-include_directories(BEFORE SYSTEM "${CMAKE_SOURCE_DIR}/third-party/nv-codec-headers/include")
+include_directories(
+        BEFORE SYSTEM
+        "${CMAKE_SOURCE_DIR}/third-party/build-deps/third-party/FFmpeg/nv-codec-headers/include"
+)
 file(GLOB NVENC_SOURCES CONFIGURE_DEPENDS "src/nvenc/*.cpp" "src/nvenc/*.h")
 list(APPEND PLATFORM_TARGET_FILES ${NVENC_SOURCES})