Installation of the header file tlog.h in cmake

In CMakeLists.txt，with install cmd：

```cmake
install(FILES tlog.h DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/tlog.h)
```

will install tlog.h to：/usr/include/tlog.h/tlog.h，is this expected behavior?

If you just want to install tlog.h to /usr/incldue, it should be like this:

```cmake
install(FILES tlog.h DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
```