Set SDL_HINT_APP_NAME for tiles

See https://wiki.libsdl.org/SDL2/SDL_HINT_APP_NAME

src/sdltiles.cpp

@@ -190,6 +190,13 @@ static void InitSDL()
     SDL_SetHint( SDL_HINT_IME_SUPPORT_EXTENDED_TEXT, "1" );
 #endif
 
+#if defined(SDL_HINT_APP_NAME)
+    // Requires SDL 2.0.18. String used multiple ways, one of them is the game
+    // identifying itself when asking to inhibit screensaver via dbus under
+    // Linux.
+    SDL_SetHint( SDL_HINT_APP_NAME, _( "Cataclysm: Dark Days Ahead" ) );
+#endif
+
 #if defined(__linux__)
     // https://bugzilla.libsdl.org/show_bug.cgi?id=3472#c5
     if( SDL_COMPILEDVERSION == SDL_VERSIONNUM( 2, 0, 5 ) ) {
@@ -4198,3 +4205,4 @@ bool window_contains_point_relative( const catacurses::window &win, const point
     const half_open_rectangle<point> win_bounds( point::zero, bound );
     return win_bounds.contains( p );
 }
+