CMakeLists.txt: limit libraries linked to by ${PROJECT_NAME}

Old behaviour was linking to all components, but main.c currently only
needs a few of them.

CMakeLists.txt

@@ -69,11 +69,12 @@ set(interfaces
 )
 
 target_compile_options(${PROJECT_NAME} PUBLIC ${cflags})
+# Dependencies for main.c
+target_link_libraries(${PROJECT_NAME} PRIVATE system game)
 
 foreach(c ${components})
     add_subdirectory("src/${c}")
     target_compile_options(${c} PUBLIC ${cflags})
-    target_link_libraries(${PROJECT_NAME} PRIVATE ${c})
 endforeach()
 
 foreach(i ${interfaces})