Bump newlib to 4.4.0

[cmuellner]

This commit bumps newlib from 4.3.0 to 4.4.0.

                === gcc Summary ===                                                                                                                                                                                                         
                                                                                                                                                                                                                                            
# of expected passes            722                                                                                                                                                                                                         
# of unexpected failures        28                                                                                                                                                                                                          
# of unsupported tests          72

               ========= Summary of gcc testsuite =========       
                            | # of unexpected case / # of unique unexpected case
                            |          gcc |          g++ |     gfortran |
     rv64gc/  lp64d/ medlow |    0 /     0 |    0 /     0 |      - |

[kito-cheng]

Thanks:)