cmake: make sure SDL_GetPrefPath is run before testfilesystem

60 seconds timeout ought to be sufficient.

test/testfilesystem_pre.c

@@ -0,0 +1,32 @@
+/*
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely.
+*/
+/* Call SDL_GetPrefPath to warm the SHGetFolderPathW cache */
+
+/**
+ * We noticed frequent ci timeouts running testfilesystem on 32-bit Windows.
+ * Internally, this functions calls Shell32.SHGetFolderPathW.
+ */
+
+#include "SDL.h"
+
+int main(int argc, char *argv[])
+{
+    Uint64 start;
+    (void)argc;
+    (void)argv;
+    SDL_Init(0);
+    start = SDL_GetTicks();
+    SDL_GetPrefPath("libsdl", "test_filesystem");
+    SDL_Log("SDL_GetPrefPath took %" SDL_PRIu64 "ms", SDL_GetTicks() - start);
+    SDL_Quit();
+    return 0;
+}