debian/copyright: fix field-name-typo-in-dep5-copyright lintian tag
-rw-r--r-- 1704 CMakeLists.txt
-rw-r--r-- 7816 COPYING.LESSER.txt
-rw-r--r-- 35821 COPYING.txt
-rw-r--r-- 1639 ChangeLog.txt
-rw-r--r-- 7199 INSTALL.txt
-rw-r--r-- 1566 README.txt
drwxr-xr-x - cmake_extras
drwxr-xr-x - debian
drwxr-xr-x - src