Windows: Improve private symbol detection

To detect if private of public symbols were loaded we were relying
on a strcmp with a known filename, which was not great, the symbol
api has a field we can query which should be more flexible and
reliable.

source/blender/blenlib/intern/system_win32.c

@@ -309,8 +309,7 @@ static bool bli_private_symbols_loaded()
   IMAGEHLP_MODULE64 m64;
   m64.SizeOfStruct = sizeof(m64);
   if (SymGetModuleInfo64(GetCurrentProcess(), (DWORD64)GetModuleHandle(NULL), &m64)) {
-    PathStripPath(m64.LoadedPdbName);
-    return BLI_strcasecmp(m64.LoadedPdbName, "blender_private.pdb") == 0;
+    return m64.GlobalSymbols;
   }
   return false;
 }