Fix make build by depending on target name instead of TARGET_OBJECTS in custom command

The Makefile generator does not create a rule for individual object files
when $<TARGET_OBJECTS:...> is used in DEPENDS of add_custom_command. Depending
on the target name instead establishes a proper target-level dependency.

CMakeLists.txt

@@ -119,7 +119,7 @@ add_custom_command(
   OUTPUT ${CMAKE_BINARY_DIR}/${PROJECT_NAME}.o
   COMMAND ${LD_EXE} -r $<TARGET_OBJECTS:${PROJECT_NAME}-object> -o
           ${CMAKE_BINARY_DIR}/${PROJECT_NAME}.o
-  DEPENDS $<TARGET_OBJECTS:${PROJECT_NAME}-object>
+  DEPENDS ${PROJECT_NAME}-object
   COMMAND_EXPAND_LISTS)
 
 add_library(${PROJECT_NAME} SHARED ${CMAKE_BINARY_DIR}/${PROJECT_NAME}.o)