Rotate ChangeLog files - part 1 - add ChangeLog-2021.
2022-01-03 Jakub Jelinek <jakub@redhat.com>
gcc/
* ChangeLog-2021: Rotate ChangeLog. New file.
gcc/ada/
* ChangeLog-2021: Rotate ChangeLog. New file.
gcc/cp/
* ChangeLog-2021: Rotate ChangeLog. New file.
gcc/d/
* ChangeLog-2021: Rotate ChangeLog. New file.
gcc/fortran/
* ChangeLog-2021: Rotate ChangeLog. New file.
gcc/testsuite/
* ChangeLog-2021: Rotate ChangeLog. New file.
libgfortran/
* ChangeLog-2021: Rotate ChangeLog. New file.
libstdc++-v3/
* ChangeLog-2021: Rotate ChangeLog. New file.