Fix #166 Install path on Win32
Fix #166 Install path on Win32

make "C:/Parrot" the default win32 prefix
- This is 1. analog to ActivePerl, strawberry and vanilla perl,
- and 2. it is technically hard to get the ${PROGRAMFILES} path 
  if undefined, and without perl libwin32.



git-svn-id: 6e74a02f85675cec270f5d931b0f6998666294a3@35927 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot