use SDL2 everywhere

Some files were still including SDL-1 headers even though we only link
against SDL2 libs.

URL: https://bugs.gentoo.org/551882
Reported-by: Barnaby <badbit@me.com>
Reported-by: Romain Naour <romain.naour@openwide.fr>

configure.ac

@@ -1958,13 +1958,13 @@ AC_SUBST([have_evas_engine_gl_xcb])
 if test "x$have_evas_engine_gl_sdl" = "xyes" || test "x$have_evas_engine_gl_sdl" = "xstatic" ; then
    AC_CHECK_DECL([SDL_GL_CONTEXT_MAJOR_VERSION],
       [AC_DEFINE([HAVE_SDL_GL_CONTEXT_VERSION], [1], [SDL_GL version attributes present])],,
-      [#include <SDL/SDL_video.h>])
+      [#include <SDL2/SDL_video.h>])
 fi
 
 if test "${with_opengl}" = "es"; then
    AC_CHECK_DECL([SDL_OPENGLES],
       [AC_DEFINE([HAVE_SDL_FLAG_OPENGLES], [1], [SDL_OPENGLES flag is present])],,
-      [#include <SDL/SDL_video.h>])
+      [#include <SDL2/SDL_video.h>])
 fi
 
 # OpenGL common

m4/evas_check_engine.m4

@@ -478,11 +478,11 @@ if test "x${have_dep}" = "xyes" ; then
    evas_engine_[]$1[]_libs="${evas_engine_[]$1[]_libs} -lGL -lm $gl_pt_lib"
    evas_engine_gl_common_libs="-lGL -lm $gl_pt_lib"
 else
-   AC_CHECK_HEADER([SDL/SDL_opengles.h],
+   AC_CHECK_HEADER([SDL2/SDL_opengles.h],
       [have_egl="yes"],
       [have_egl="no"],
       [
-#include <SDL/SDL_opengles.h>
+#include <SDL2/SDL_opengles.h>
 #include <EGL/egl.h>
       ])
    if test "x${have_egl}" = "xyes" ; then

src/modules/evas/engines/gl_common/evas_gl_common.h

@@ -25,9 +25,9 @@
 #else
 # ifdef _EVAS_ENGINE_SDL_H
 #  ifdef GL_GLES
-#   include <SDL/SDL_opengles.h>
+#   include <SDL2/SDL_opengles.h>
 #  else
-#   include <SDL/SDL_opengl.h>
+#   include <SDL2/SDL_opengl.h>
 #  endif
 # else
 #  ifdef GL_GLES

src/modules/evas/engines/gl_sdl/Evas_Engine_GL_SDL.h

@@ -1,7 +1,7 @@
 #ifndef _EVAS_ENGINE_GL_SDL_H
 #define _EVAS_ENGINE_GL_SDL_H
 
-#include <SDL/SDL.h>
+#include <SDL2/SDL.h>
 
 typedef struct _Evas_Engine_Info_GL_SDL              Evas_Engine_Info_GL_SDL;