I spotted a few misplaced entries in the ChangeLog-2019 entries, and
went on to fix them.
Looking around I saw a good number of other entries in other years.
Then OCD got the best of me and I fixed them all.
Also fixes cases of wrong paths in entries, like "* gdb/foo.c" instead
of "* foo.c".
This patch rotates the GDB main ChangeLog file as per our "Start
of New Year Procedure".
2017-01-01 Joel Brobecker <brobecker@adacore.com>
* config/djgpp/fnchange.lst: Add entry for gdb/ChangeLog-2016.