SDL_net: ci: don't build example on msys2

SDL Commits
1 
From e2a47cb6164f10a39608acff0fb4c9b7523aa8e5 Mon Sep 17 00:00:00 2001
From: Anonymous Maarten <[EMAIL REDACTED]>
Date: Tue, 21 Jun 2022 16:30:08 +0200
Subject: [PATCH] ci: don't build example on msys2

---
 .github/workflows/main.yml | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 7aae4cf..715dbcc 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -118,6 +118,10 @@ jobs:
         mkdir build-autotools
         ./autogen.sh
         set -- --prefix=$(pwd)/prefix_autotools
+        # mingw-w64-*-SDL2 doesn't have SDL_test, so only build this on Unix
+        if [ "${{ matrix.platform.shell }}" != 'sh' ]; then
+          set -- "$@" --disable-examples
+        fi
         ( cd build-autotools && ../configure "$@" )
 
     - name: Build (Autotools)