debian: remove nonexistent files from copyright

Author: fanquake

contrib/debian/copyright

@@ -15,14 +15,6 @@ Copyright: 2010-2011, Jonas Smedegaard <dr@jones.dk>
            2011, Matt Corallo <matt@bluematt.me>
 License: GPL-2+
 
-Files: src/secp256k1/build-aux/m4/ax_jni_include_dir.m4
-Copyright: 2008 Don Anderson <dda@sleepycat.com>
-License: GNU-All-permissive-License
-
-Files: src/secp256k1/build-aux/m4/ax_prog_cc_for_build.m4
-Copyright: 2008 Paolo Bonzini <bonzini@gnu.org>
-License: GNU-All-permissive-License
-
 Files: src/qt/res/icons/add.png
        src/qt/res/icons/address-book.png
        src/qt/res/icons/chevron.png
@@ -112,12 +104,6 @@ License: Expat
  TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
-License: GNU-All-permissive-License
- Copying and distribution of this file, with or without modification, are
- permitted in any medium without royalty provided the copyright notice
- and this notice are preserved. This file is offered as-is, without any
- warranty.
-
 License: GPL-2+
  This program is free software; you can redistribute it and/or modify it
  under the terms of the GNU General Public License as published by the