This reverts commit fcd3b3c473.
Turns out that removing the ChangeLog files causes the Wget build to
fail. While this issue is investigated and sorted out, the commit is
reversed to allow people to be able to build Wget from master
From v1.16.1 onwards, Wget no longer maintains an active ChangeLog file.
Instead the ChangeLog will be automatically generated on each release
through gnulib's gitlog-to-changelog script. However, the old versions
of the ChangeLog files are retained for reference. These files are
renamed with a .pre-gitlog appended to their filenames.
Also removed ChangeLog.README file which is not required anymore
