SDL_image: cmake: build SDL2_image with -static-libgcc when using MinGW toolchain

SDL Commits
1 
From a0d0e1b5a21e4d3ded4bc58e1b1893cc2e17c3bf Mon Sep 17 00:00:00 2001
From: Anonymous Maarten <[EMAIL REDACTED]>
Date: Fri, 3 Jan 2025 23:57:27 +0100
Subject: [PATCH] cmake: build SDL2_image with -static-libgcc when using MinGW
 toolchain

This avoids a runtime dependency on libgcc_x_seh-1.dll (or a similarly named library)
---
 CMakeLists.txt | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0d86d261..1d737799 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -248,6 +248,9 @@ if(WIN32 AND SDL2IMAGE_BUILD_SHARED_LIBS)
     target_sources(SDL2_image PRIVATE
         src/version.rc
     )
+    if(MINGW)
+        target_link_options(SDL2_image PRIVATE -static-libgcc)
+    endif()
 endif()
 set_target_properties(SDL2_image PROPERTIES
     DEFINE_SYMBOL DLL_EXPORT