cataclysm-dda{,-git}: apply locale patch dynamically

Each time src/translations.cpp is modified, we have to update the locale
patch. Using sed to patch dynamically should be handy.

pkgs/games/cataclysm-dda/common.nix

···
 
     postPatch = ''
       patchShebangs .
+
+      # Locale patch required for Darwin builds, see:
+      # https://github.com/NixOS/nixpkgs/pull/74064#issuecomment-560083970
+      sed -i src/translations.cpp \
+          -e 's@#elif (defined(__linux__) || (defined(MACOSX) && !defined(TILES)))@#elif 1@'
     '';
 
     makeFlags = [

pkgs/games/cataclysm-dda/default.nix

···
     sha256 = "15l6w6lxays7qmsv0ci2ry53asb9an9dh7l7fc13256k085qcg68";
   };
 
-  patches = [ ./patches/fix_locale_dir.patch ];
-
   meta = with stdenv.lib.maintainers; common.meta // {
     maintainers = common.meta.maintainers ++ [ skeidel ];
   };

pkgs/games/cataclysm-dda/git.nix

···
     sha256 = "0ww2q5gykxm802z1kffmnrfahjlx123j1gfszklpsv0b1fccm1ab";
   };
 
-  patches = [
-    # Locale patch required for Darwin builds, see: https://github.com/NixOS/nixpkgs/pull/74064#issuecomment-560083970
-    ./patches/fix_locale_dir_git.patch
-  ];
-
   makeFlags = common.makeFlags ++ [
     "VERSION=git-${version}-${substring 0 8 src.rev}"
   ];

pkgs/games/cataclysm-dda/patches/fix_locale_dir.patch

···
---- a/src/translations.cpp
-+++ b/src/translations.cpp
-@@ -212,14 +212,12 @@ void set_language()
-     auto env = getenv( "LANGUAGE" );
-     locale_dir = std::string( PATH_INFO::base_path() + "lang/mo/" + ( env ? env : "none" ) +
-                               "/LC_MESSAGES/cataclysm-dda.mo" );
--#elif (defined(__linux__) || (defined(MACOSX) && !defined(TILES)))
-+#else
-     if( !PATH_INFO::base_path().empty() ) {
-         locale_dir = PATH_INFO::base_path() + "share/locale";
-     } else {
-         locale_dir = "lang/mo";
-     }
--#else
--    locale_dir = "lang/mo";
- #endif
- 
-     const char *locale_dir_char = locale_dir.c_str();

pkgs/games/cataclysm-dda/patches/fix_locale_dir_git.patch

···
-diff --git a/src/translations.cpp b/src/translations.cpp
-index 067e2cd77d..5660d18b3d 100644
---- a/src/translations.cpp
-+++ b/src/translations.cpp
-@@ -211,14 +211,12 @@ void set_language()
-     auto env = getenv( "LANGUAGE" );
-     locale_dir = std::string( FILENAMES["base_path"] + "lang/mo/" + ( env ? env : "none" ) +
-                               "/LC_MESSAGES/cataclysm-dda.mo" );
--#elif (defined(__linux__) || (defined(MACOSX) && !defined(TILES)))
-+#else
-     if( !FILENAMES["base_path"].empty() ) {
-         locale_dir = FILENAMES["base_path"] + "share/locale";
-     } else {
-         locale_dir = "lang/mo";
-     }
--#else
--    locale_dir = "lang/mo";
- #endif
-
-     const char *locale_dir_char = locale_dir.c_str();