BUG #12755: pg_upgrage creates potentially dangerous delete_old_cluster.bat

The following bug has been logged on the website:

Bug reference:      12755
Logged by:          Toni Helenius
Email address:      toni.helenius@syncrontech.com
PostgreSQL version: 9.4.1
Operating system:   Windows 7
Description:

pg_upgrage creates potentially dangerous delete_old_cluster.bat. RMDIR
without quotes.

RMDIR /s/q C:\Program Files\PostgreSQL\9.3\data

Executes as:
RMDIR /s/q C:\Program

Needs quotes!!