Ensure properly built before installing

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_4_BRANCH@18846 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

wxPython/b

@@ -49,7 +49,7 @@ elif [ "$1" = "t" ]; then
 # "i" --> install
 elif [ "$1" = "i" ]; then
     shift
-    CMD="$SETUP $FLAGS $OTHERFLAGS install $*"
+    CMD="$SETUP $FLAGS $OTHERFLAGS build_ext install $*"
 
 # "s" --> source dist
 elif [ "$1" = "s" ]; then