Include header files in CMake sources (#16297)

src/CMakeLists.txt

@@ -445,8 +445,11 @@ set(independent_SRCS
 	${util_SRCS}
 )
 
+file(GLOB common_HDRS "${CMAKE_CURRENT_SOURCE_DIR}/*.h")
+
 # /!\ Consider carefully before adding files here /!\
 set(common_SRCS
+	${common_HDRS}
 	clientdynamicinfo.cpp
 	collision.cpp
 	content_mapnode.cpp