Fix wxwidgets download path.

external/get_externals_win.sh

@@ -20,7 +20,7 @@ _download()
   wget http://www.equi4.com/pub/mk/metakit-2.4.9.7.tar.gz
   wget ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/pcre-7.6.tar.gz
   wget http://kent.dl.sourceforge.net/sourceforge/tinyxml/tinyxml_2_5_3.tar.gz
-  wget http://biolpc22.york.ac.uk/pub/2.8.9/wxWidgets-2.8.10.tar.bz2
+  wget http://biolpc22.york.ac.uk/pub/2.8.10/wxWidgets-2.8.10.tar.bz2
 
   popd
 }