Remove #ifdef SDL_HINT_NO_SIGNAL_HANDLERS check (#1763)

This hint has been in SDL2 since 2.0.4 and the minimum SDL2 version is now 2.0.14.

Author: mfrancis95

src/i_main.c

@@ -68,9 +68,7 @@ int main(int argc, char **argv)
     M_FindResponseFile();
     M_SetExeDir();
 
-    #ifdef SDL_HINT_NO_SIGNAL_HANDLERS
     SDL_SetHint(SDL_HINT_NO_SIGNAL_HANDLERS, "1");
-    #endif
 
     // start doom