Fix build with gcc-15

• d/control:
  • Bump Standards-Version to 4.7.3 (no changes)
  • Remove redundant Priority field
  • Remove redundant Rules-Requires-Root field
• d/copyright:
  • Add myself in debian/*
  • Remove physical address
• d/p/Fix-build-with-gcc-15.patch: New Patch (Closes: #1097441)
• d/watch: Bump to Version 5