Motivation for this change

Using the .patch file extension means these files are ignored by editorconfig.

pkgs/applications/audio/yasr/10_fix_openpty_forkpty_declarations:
	7: Trailing whitespace
	12: Trailing whitespace
	18: Trailing whitespace
	23: Trailing whitespace
pkgs/applications/audio/yasr/20_maxpathlen:
	9: Trailing whitespace
pkgs/applications/audio/yasr/40_dectalk_extended_chars:
	7: Trailing whitespace
pkgs/development/tools/misc/cproto/cproto_patch:
	9: Trailing whitespace
pkgs/development/ocaml-modules/gmetadom/gcc-4.3.dpatch:
	13: Trailing whitespace
	16: Trailing whitespace
	18: Trailing whitespace

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Ensured that relevant documentation is up to date
• Fits CONTRIBUTING.md.