SDL_image: cmake: build SDL3_image.dll with -static-libgcc using a MingW toolchain

SDL Commits
1 
From fd53ea28e77e59320fc6204bd30c7cc91992c52f Mon Sep 17 00:00:00 2001
From: Anonymous Maarten <[EMAIL REDACTED]>
Date: Fri, 3 Jan 2025 16:46:24 +0100
Subject: [PATCH] cmake: build SDL3_image.dll with -static-libgcc using a MingW
 toolchain

This avoids a runtime dependency on libgcc_s_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 44d03e8a..ccb745a4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -299,6 +299,9 @@ if(WIN32 AND SDLIMAGE_BUILD_SHARED_LIBS)
     target_sources(${sdl3_image_target_name} PRIVATE
         src/version.rc
     )
+    if(MINGW)
+        target_link_options(${sdl3_image_target_name} PRIVATE -static-libgcc)
+    endif()
 endif()
 set_target_properties(${sdl3_image_target_name} PROPERTIES
     OUTPUT_NAME "SDL3_image"