Windows: ignore missing SetProcessDPIAware() on Window XP

Author: foone

mss/windows.py

@@ -89,7 +89,10 @@ def __init__(self):
                 self.user32.PROCESS_PER_MONITOR_DPI_AWARE
             )
         except AttributeError:
-            self.user32.SetProcessDPIAware()
+            try:
+                self.user32.SetProcessDPIAware()
+            except AttributeError:
+                pass  # Windows XP doesn't have SetProcessDPIAware
 
         self._srcdc = self.user32.GetWindowDC(0)
         self._memdc = self.gdi32.CreateCompatibleDC(self._srcdc)