[ox/mc] Fix build issues encountered when using MetalClawDefWriter

deps/ox/src/ox/mc/CMakeLists.txt

@@ -1,5 +1,7 @@
 add_library(
 	OxMetalClaw
+		defread.cpp
+		deftypes.cpp
 		defwriter.cpp
 		presencemask.cpp
 		read.cpp
@@ -20,6 +22,7 @@ set_property(
 
 install(
 	FILES
+		defread.hpp
 		deftypes.hpp
 		defwriter.hpp
 		err.hpp
@@ -27,7 +30,7 @@ install(
 		presencemask.hpp
 		read.hpp
 		types.hpp
-		walker.cpp
+		walker.hpp
 		write.hpp
 	DESTINATION
 		include/ox/mc