wxPython: Fix installing headers.

mingw-w64-wxPython/001-mingw-python.patch

@@ -26,6 +26,15 @@
      value = os.popen(cmd, 'r').read()[:-1]
      return value
  
+@@ -511,7 +511,7 @@
+         distutils.command.install_headers.install_headers.finalize_options(self)
+ 
+     def run(self):
+-        if os.name == 'nt':
++        if os.name == 'nt' and not "MSYSTEM" in os.environ:
+             return
+         headers = self.distribution.headers
+         if not headers:
 @@ -602,7 +602,7 @@
  def findLib(name, libdirs):
      name = makeLibName(name)[0]