SDL_mixer: cmake: build SDL3_ttf.dll with -static-libgcc using a MingW toolchain

SDL Commits
1 
From 9a619826b82e7fd0b7401bd941a79ee34dc8c76d Mon Sep 17 00:00:00 2001
From: Anonymous Maarten <[EMAIL REDACTED]>
Date: Fri, 3 Jan 2025 16:44:53 +0100
Subject: [PATCH] cmake: build SDL3_ttf.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 25f72dca..2c9dac23 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -302,6 +302,9 @@ if(WIN32 AND BUILD_SHARED_LIBS)
     target_sources(${sdl3_mixer_target_name} PRIVATE
         src/version.rc
     )
+    if(MINGW)
+        target_link_options(${sdl3_mixer_target_name} PRIVATE -static-libgcc)
+    endif()
 endif()
 set_target_properties(${sdl3_mixer_target_name} PROPERTIES
     OUTPUT_NAME "SDL3_mixer"