bash version of wxPython's b script for win32

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@27699 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

wxPython/b

@@ -1,4 +1,11 @@
-#!/bin/sh
+#!/bin/bash
+
+# Are we using bash on win32?  If so source that file and then exit.
+if [ "$OSTYPE" = "cygwin" ]; then
+    source b.win32
+    exit
+fi
+
 
 function getpyver {
     if [ "$1" = "15" ]; then