Add missing Metadata.cpp for Mac build

Author: makuto

Bootstrap_Mac.cake

@@ -18,6 +18,7 @@
  "ModuleManager.cpp"
  "Logging.cpp"
  "Build.cpp"
+ "Metadata.cpp"
  "Main.cpp")
 
 (add-build-options "-DMACOS" "-Wall" "-Werror")

Build_Mac.sh

@@ -29,6 +29,7 @@ else
 		src/ModuleManager.cpp \
 		src/Logging.cpp \
 		src/Build.cpp \
+		src/Metadata.cpp \
 		src/Main.cpp \
 		-DMACOS || exit $?
 	# Need -ldl for dynamic loading, -rdynamic to let compile-time functions resolve to