reverted opengles removal.

cmake/sdlchecks.cmake

@@ -700,6 +700,15 @@ endmacro()
 # - nada
 macro(CheckOpenGLES)
   if(SDL_OPENGLES)
+    check_c_source_compiles("
+        #include <GLES/gl.h>
+        #include <GLES/glext.h>
+        int main (int argc, char** argv) { return 0; }" HAVE_OPENGLES_V1)
+    if(HAVE_OPENGLES_V1)
+        set(HAVE_OPENGLES TRUE)
+        set(SDL_VIDEO_OPENGL_ES 1)
+        set(SDL_VIDEO_RENDER_OGL_ES 1)
+    endif()
     check_c_source_compiles("
         #include <GLES2/gl2.h>
         #include <GLES2/gl2ext.h>