SDL: cmake: Fix test linking with MinGW

SDL Commits
1 
From 77141e84e07513b2c6f864a9afa9f5c0b10b2e56 Mon Sep 17 00:00:00 2001
From: Cameron Gutman <[EMAIL REDACTED]>
Date: Sun, 31 Oct 2021 18:53:11 -0500
Subject: [PATCH] cmake: Fix test linking with MinGW

---
 test/CMakeLists.txt | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index aae1ddc5b7..0531568d10 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -6,9 +6,14 @@ project(SDL2 C)
 remove_definitions(-DUSING_GENERATED_CONFIG_H)
 link_libraries(SDL2_test SDL2-static)
 
-# FIXME: Parent directory CMakeLists.txt only sets these for mingw/cygwin,
-# but we need them for VS as well.
 if(WINDOWS)
+    # mingw32 must come before SDL2main to link successfully
+    if(MINGW OR CYGWIN)
+        link_libraries(mingw32)
+    endif()
+
+    # FIXME: Parent directory CMakeLists.txt only sets these for mingw/cygwin,
+    # but we need them for VS as well.
     link_libraries(SDL2main)
     add_definitions(-Dmain=SDL_main)
 endif()