SDL: add SDL_AndroidShowToast for https://developer.android.com/reference/android/widget/Toast (56965)

SDL Commits
1 
From 5696582e1d58435b4637617d0d956ce9a0457010 Mon Sep 17 00:00:00 2001
From: Amir <[EMAIL REDACTED]>
Date: Fri, 19 Feb 2021 14:22:31 +0300
Subject: [PATCH] add SDL_AndroidShowToast for
 https://developer.android.com/reference/android/widget/Toast

---
 include/SDL_system.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/SDL_system.h b/include/SDL_system.h
index f0134417d..adf1c0359 100644
--- a/include/SDL_system.h
+++ b/include/SDL_system.h
@@ -228,6 +228,7 @@ extern DECLSPEC SDL_bool SDLCALL SDL_AndroidRequestPermission(const char *permis
                 choose some value from https://developer.android.com/reference/android/view/Gravity
     xOffset   : set this parameter only when gravity >=0
     yOffset   : set this parameter only when gravity >=0
+    Returns 0 if success, -1 if any error occured.
 */
 extern DECLSPEC int SDLCALL SDL_AndroidShowToast(const char* message, int duration, int gravity, int xOffset, int yOffset);