SDL_net: cmake: build SDL3_net.dll with -static-libgcc using a MingW toolchain

SDL Commits
1 
From 3da5b6dfa360b24b7ce798ced807ab6e1fc2a682 Mon Sep 17 00:00:00 2001
From: Anonymous Maarten <[EMAIL REDACTED]>
Date: Fri, 3 Jan 2025 16:48:31 +0100
Subject: [PATCH] cmake: build SDL3_net.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 922e067..8e14567 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -131,6 +131,9 @@ if(WIN32)
         target_sources(${sdl3_net_target_name} PRIVATE
             src/version.rc
         )
+        if(MINGW)
+            target_link_options(${sdl3_net_target_name} PRIVATE -static-libgcc)
+        endif()
     endif()
     target_link_libraries(${sdl3_net_target_name} PRIVATE iphlpapi ws2_32)
     list(APPEND PC_LIBS -liphlpapi -lws2_32)