[CMake] Correct dependencies

HeaderDependencies.cpp and the stdlib filelist didn't have dependencies.
That causes issues when the content is changed.

Author: rintaro

SwiftCompilerSources/CMakeLists.txt

@@ -250,6 +250,7 @@ else()
 ")
   add_custom_command(
     OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/HeaderDependencies.cpp"
+    DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/HeaderDependencies.cpp.tmp"
     COMMAND ${CMAKE_COMMAND} -E copy_if_different
       "${CMAKE_CURRENT_BINARY_DIR}/HeaderDependencies.cpp.tmp"
       "${CMAKE_CURRENT_BINARY_DIR}/HeaderDependencies.cpp"

stdlib/cmake/modules/SwiftSource.cmake

@@ -978,7 +978,8 @@ function(_compile_swift_files
     add_custom_command_target(unused_var
       COMMAND ${CMAKE_COMMAND} -E copy_if_different "${file_path}.tmp" "${file_path}"
       CUSTOM_TARGET_NAME ${file_path_target}
-      OUTPUT "${file_path}")
+      OUTPUT "${file_path}"
+      DEPENDS "${file_path}.tmp")
   endif()
 
   # If this platform/architecture combo supports backward deployment to old