k9copy: fix build with gcc6

pkgs/applications/video/k9copy/default.nix

@@ -14,6 +14,10 @@ stdenv.mkDerivation rec {
     sha256 = "0dp06rwihks50c57bbv04d6bj2qc88isl91971r4lii2xp0qn7sg";
   };
 
+  patches = [
+    ./gcc6.patch
+  ];
+
   cmakeFlags = [
     "-DQT5_BUILD=ON"
     "-DCMAKE_MINIMUM_REQUIRED_VERSION=3.0"

pkgs/applications/video/k9copy/gcc6.patch

@@ -0,0 +1,26 @@
+diff --git c/src/backup/k9dvdbackup.cpp i/src/backup/k9dvdbackup.cpp
+index f5e4859..82fa392 100755
+--- c/src/backup/k9dvdbackup.cpp
++++ i/src/backup/k9dvdbackup.cpp
+@@ -907,7 +907,7 @@ k9Vobu * k9DVDBackup::remapOffset(uint32_t _sector,uint32_t *_offset,int _dir) {
+ 
+ 
+         if ((vobu1 !=NULL) && (vobu2!=NULL)) {
+-            *_offset = abs(vobu1->newSector - vobu2->newSector)  | maskOffset1 ;
++            *_offset = (vobu1->newSector - vobu2->newSector)  | maskOffset1 ;
+             *_offset |= maskOffset2;
+             return vobu2;
+         }
+diff --git c/src/backup/k9execcopy.cpp i/src/backup/k9execcopy.cpp
+index d59222c..35de923 100644
+--- c/src/backup/k9execcopy.cpp
++++ i/src/backup/k9execcopy.cpp
+@@ -306,7 +306,7 @@ void k9ExecCopy::createMkv(k9DVDTitle *_title,const QString &_filename,QMultiMap
+ 
+ #if QT_VERSION >= 0x050000
+     m_progressDialog=new QProgressDialog(k9Dialogs::getMainWidget() );
+-    m_progressDialog->setCancelButton(false);
++    m_progressDialog->setCancelButton(0);
+ 
+ #else
+     m_progressDialog=new KProgressDialog(k9Dialogs::getMainWidget() );