[vala/wip/sdl2] sdl2: Attribute GL.ContextFlag with Flags

[Rico Tzschichholz <ricotz src gnome org>]

commit 71e351523713af404e8dbaeac210000cdedd96b3
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Mon Jan 25 17:40:09 2021 +0100

    sdl2: Attribute GL.ContextFlag with Flags

 vapi/sdl2.vapi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/vapi/sdl2.vapi b/vapi/sdl2.vapi
index 0d89af276..ed4350e9c 100644
--- a/vapi/sdl2.vapi
+++ b/vapi/sdl2.vapi
@@ -3246,7 +3246,7 @@ namespace SDL {
                                CORE, COMPATIBILITY, ES;
                        }// GLprofile
 
-                       [CCode (cname = "SDL_GLcontextFlag", cprefix = "SDL_GL_CONTEXT_", cheader_filename = 
"SDL2/SDL_video.h")]
+                       [Flags, CCode (cname = "SDL_GLcontextFlag", cprefix = "SDL_GL_CONTEXT_", 
cheader_filename = "SDL2/SDL_video.h")]
                        public enum ContextFlag {
                                DEBUG_FLAG, FORWARD_COMPATIBLE_FLAG, ROBUST_ACCESS_FLAG, RESET_ISOLATION_FLAG
                        }