vita: allow GLES support without GL support

CMakeLists.txt

@@ -2450,7 +2450,6 @@ elseif(VITA)
       check_include_file(gpu_es4/psp2_pvr_hint.h HAVE_PVR_H)
       if(HAVE_PVR_H)
         target_compile_definitions(sdl-build-options INTERFACE "__psp2__")
-        check_include_file(gl4esinit.h HAVE_GL4ES_H)
         set(SDL_VIDEO_OPENGL_EGL 1)
         set(HAVE_OPENGLES TRUE)
         set(SDL_VIDEO_OPENGL_ES 1)
@@ -2466,12 +2465,15 @@ elseif(VITA)
         set(HAVE_VIDEO_VITA_PVR ON)
         set(SDL_VIDEO_VITA_PVR 1)
 
-        if(HAVE_GL4ES_H)
-          set(HAVE_OPENGL TRUE)
-          set(SDL_VIDEO_OPENGL 1)
-          set(SDL_VIDEO_RENDER_OGL 1)
-          list(APPEND SDL_EXTRA_LIBS libGL_stub)
-          set(SDL_VIDEO_VITA_PVR_OGL 1)
+        if(SDL_OPENGL)
+          check_include_file(gl4esinit.h HAVE_GL4ES_H)
+          if(HAVE_GL4ES_H)
+            set(HAVE_OPENGL TRUE)
+            set(SDL_VIDEO_OPENGL 1)
+            set(SDL_VIDEO_RENDER_OGL 1)
+            list(APPEND SDL_EXTRA_LIBS libGL_stub)
+            set(SDL_VIDEO_VITA_PVR_OGL 1)
+          endif()
         endif()
 
       else()