get rid of the MY_SDL_VER definition

We depend on SDL for more than just a handful of additional variables.

.travis.sh

@@ -1,6 +1,6 @@
 #!/bin/sh
 if [ "$ANALYZE" = "true" ] ; then
-	cppcheck --error-exitcode=1 -j2 -DMY_SDL_VER -DRANGECHECK -DDOGS -DBETA -ISource Source 2> stderr.txt
+	cppcheck --error-exitcode=1 -j2 -DRANGECHECK -DDOGS -DBETA -ISource Source 2> stderr.txt
 	RET=$?
 	if [ -s stderr.txt ]
 	then

Source/i_system.c

@@ -271,7 +271,7 @@ void I_Quit (void)
       G_CheckDemoStatus();
    M_SaveDefaults();
 
-#if defined(MY_SDL_VER) && defined(_MSC_VER)
+#if defined(_MSC_VER)
    // Under Visual C++, the console window likes to rudely slam
    // shut -- this can stop it
    if(*errmsg || waitAtExit)

Source/m_misc.c

@@ -83,7 +83,6 @@ extern int realtic_clock_rate;         // killough 4/13/98: adjustable timer
 extern int tran_filter_pct;            // killough 2/21/98
 extern int showMessages;
 
-#ifdef MY_SDL_VER
 extern int i_SDLJoystickNum;
 extern int joystickSens_x;
 extern int joystickSens_y;
@@ -93,7 +92,6 @@ extern int grabmouse;
 extern int cfg_scalefactor; // haleyjd 05/11/09
 extern int cfg_aspectratio; // haleyjd 05/11/09
 extern int fullscreen;
-#endif
 
 extern char *chat_macros[], *wad_files[], *deh_files[];  // killough 10/98
 
@@ -1686,7 +1684,6 @@ default_t defaults[] = {
     "ninth choice for weapon (worst)"
   },
 
-#ifdef MY_SDL_VER
     // haleyjd 04/15/02: SDL joystick device number
   {
     "joystick_num",
@@ -1751,7 +1748,6 @@ default_t defaults[] = {
     {0}, {0, 1}, number, ss_none, wad_no,
     "1 to enable fullscreen mode"
   },
-#endif
 
   {NULL}         // last entry
 };

configure.ac

@@ -16,7 +16,6 @@ AC_SEARCH_LIBS([dlopen], [dl dld], [AC_CHECK_FUNCS([dlopen])])
 PKG_CHECK_MODULES([SDL],       [sdl2])
 PKG_CHECK_MODULES([SDL_mixer], [SDL2_mixer])
 PKG_CHECK_MODULES([SDL_net],   [SDL2_net])
-AC_DEFINE([MY_SDL_VER], [1], [This is WinMBF])
 AC_DEFINE([RANGECHECK], [1], [Parameter Validation Debugging])
 
 # Checks for header files.