Sdl12-compat: EventFilter20to12 must be SDLCALL

SDL Commits
1 
From 508432dfa6d0aea2ac503833c1796884f784eb4a Mon Sep 17 00:00:00 2001
From: Ozkan Sezer <[EMAIL REDACTED]>
Date: Fri, 19 Feb 2021 17:25:29 +0300
Subject: [PATCH] EventFilter20to12 must be SDLCALL

---
 src/SDL12_compat.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/SDL12_compat.c b/src/SDL12_compat.c
index 172a186..e7a9504 100644
--- a/src/SDL12_compat.c
+++ b/src/SDL12_compat.c
@@ -672,7 +672,7 @@ typedef union
 } SDL12_Event;
 
 typedef int (SDLCALL *SDL12_EventFilter)(const SDL12_Event *event12);
-static int EventFilter20to12(void *data, SDL_Event *event20);
+static int SDLCALL EventFilter20to12(void *data, SDL_Event *event20);
 
 typedef Uint32 (SDLCALL *SDL12_TimerCallback)(Uint32 interval);
 typedef SDL_TimerCallback SDL12_NewTimerCallback;