Remove tsdl_nop from the stubs, it's no longer needed (#96).

Because we have a regular stub to SDL_LogMessage anyways now.

src/tsdl_stubs.c

@@ -6,21 +6,6 @@
 #include "SDL.h"
 #include <caml/mlvalues.h>
 
-#ifdef _MSC_VER
-/* MSVC requires at least one extern function from SDL2 to be used.
-   If not, MSVC will not link the SDL2 import library and subsequently the
-   SDL2 DLL will not be implicitly linked (aka. load-time dynamic linking)
-   to the TSDL stub DLL. That can be verified with Unix `ldd` or MSVC
-   `dumpbin /imports`.
-   ctypes-foreign, in particular ctypes_win32_dlsym_rtld_default(), requires
-   that all foreign DLLs are already mapped into the process address space.
-   Implicit linking is the simplest way to do that.
- */
-void tsdl_nop (void) { SDL_WasInit(0); return; }
-#else
-void tsdl_nop (void) { return; }
-#endif
-
 CAMLprim value ocaml_tsdl_log_message (value c, value p, value m)
 {
   /* XXX we assume users know what they are logging and