remove unneeded HAVE_SDL2 macro

include <SDL_header> instead of <SDL2/SDL_heaaer>

configure.ac

@@ -1261,7 +1261,6 @@ if test "$sdl_req" != no; then
                 if test "$sdl_version" = 1; then
                         SDL_LIBS="$SDL_LIBS -lX11" # X11 for x11_common.o
                 else
-                        AC_DEFINE([HAVE_SDL2], [1],  [Build with SDL2 support])
                         sdl_ver_suffix=2
                 fi
                 SDL_OBJ="src/video_display/sdl${sdl_ver_suffix}.o"

src/audio/capture/sdl_mixer.c

@@ -35,21 +35,13 @@
  * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif // defined HAVE_CONFIG_H
-#include "config_unix.h"
-#include "config_win32.h"
-
-#ifdef HAVE_SDL2
-#include <SDL2/SDL.h>
-#include <SDL2/SDL_mixer.h>
-#else
-#include <SDL/SDL.h>
-#include <SDL/SDL_mixer.h>
-#endif // defined HAVE_SDL2
-
-#include <stdio.h>
+#include <SDL.h>                  // for SDL_Init, SDL_INIT_AUDIO
+#include <SDL_audio.h>            // for AUDIO_S16LSB, AUDIO_S32LSB, AUDIO_S8
+#include <SDL_mixer.h>            // for MIX_MAX_VOLUME, Mix_GetError, Mix_C...
+#include <stdio.h>                // for NULL, fclose, fopen, size_t, FILE
+#include <stdlib.h>               // for free, calloc, getenv, atoi, malloc
+#include <string.h>               // for strlen, strncat, strchr, strcmp
+#include <unistd.h>               // for unlink
 
 #include "audio/audio_capture.h"
 #include "audio/types.h"

src/video_capture/testcard2.c

@@ -39,7 +39,7 @@
  */
 
 #ifdef HAVE_CONFIG_H
-#include "config.h"                     // for HAVE_LIBSDL_TTF, HAVE_SDL2
+#include "config.h"                     // for HAVE_LIBSDL_TTF
 #endif // defined HAVE_CONFIG_H
 
 #include <assert.h>                     // for assert
@@ -57,11 +57,7 @@
 #include <time.h>                       // for time
 
 #ifdef HAVE_LIBSDL_TTF
-#ifdef HAVE_SDL2
-#include <SDL2/SDL_ttf.h>
-#else
-#include <SDL/SDL_ttf.h>
-#endif
+#include <SDL_ttf.h>
 #endif
 
 #include "audio/types.h"                // for audio_frame

src/video_display/sdl2.c

@@ -49,11 +49,7 @@
 #define SDL_DISABLE_MMINTRIN_H 1
 #define SDL_DISABLE_IMMINTRIN_H 1
 #endif // defined __arm64__
-#if __has_include(<SDL2/SDL.h>)
-#include <SDL2/SDL.h>
-#else
 #include <SDL.h>
-#endif
 
 #include <assert.h>             // for assert
 #include <ctype.h>              // for toupper