SDL_net: cmake: build SDL2_net.dll with -static-libgcc when using MinGW toolchain

SDL Commits
1 
From 17a3a532d0340dccbe94687cbe3e5ec32e73f29c Mon Sep 17 00:00:00 2001
From: Anonymous Maarten <[EMAIL REDACTED]>
Date: Sat, 4 Jan 2025 00:01:17 +0100
Subject: [PATCH] cmake: build SDL2_net.dll 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 291959e..e04cefd 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -109,6 +109,9 @@ if(WIN32)
     if(SDL2NET_BUILD_SHARED_LIBS)
         target_sources(SDL2_net PRIVATE src/version.rc)
     endif()
+    if(MINGW)
+      target_link_options(SDL2_net PRIVATE -static-libgcc)
+    endif()
 endif()
 set_target_properties(SDL2_net PROPERTIES
     DEFINE_SYMBOL DLL_EXPORT