Stripped copyrights

[trixirt]

In the review of this package inclusion into Fedora it was noted that some files have been stripped of their copyrights. Though they are in the COPYING file, it would be preferred if they were not stripped. The main point is made here bz222750

The stripping of copy right headers and relicensing should be done only by the holder.
ex/ utf8.h's copyright was stripped from utf8proc.h's and it says

'The above copyright notice and this permission notice shall be included with all copies
or substantial portions of the Software'

When the header is removed, a new user could copy utf8.* to some new project and then
the notice would not go with it.

...

The copyright notices should be returned to the top of each file derived from other sources