Those are warnings (as indicated by the W after the colon. Errors have an E there).
The warnings refer to the fact that your CPU supports SSE Instructions, which allow some fast in-hardware-parallel operations. Enabling these operations is a compile-time operation (i.e. to use SSE you need to build the library from the source enabling the specific SSE version you’re targeting), in which case you might take a look at this question.
Note, however, that SSE support influences only the computation speed. Tensorflow will work with or without SSE, but it might take longer for your code to run.
Note, also, that this influences only the CPU. If you’re using the GPU build of Tensorflow, all the operations run on the GPU will not benefit of SSE instructions.