A new windows installer for maxima 5.28.0 - the draw package works (for me)

There is a windows installer at 
http://billinghurst.customer.netspace.net.au/maxima-5.28.0-2.exe

Unlike maxima-5.28.0.exe of 25 Aug, the draw package works (at least for 
me).  I broke it while "improving" the windows configure and build 
process.  Sorry about that.  I have added a note to INSTALL.win32 to 
remind me to check this in future.

As with past windows binaries this is built with an ancient mingw/msys 
and gcl/gcc-3.3.1.  I now have the technology to build with a newer 
mingw/gcc and/or with other lisps.  As with other recent releases, there 
are two testsuite failures.  These seem to be due to the version of gcc 
used to compile gcl.  They don't occur with gcc-4.6 (but this has other 
issues).

Error summary:
Errors found in 
C:/PROGRA~1/MAXIMA~3.0/share/maxima/5.28.0-2/tests/rtest16.mac, problems:
(196 197)
2 tests failed out of 9,351 total tests.

********************** Problem 196 ***************
Input:
float((2^60-1)/2^60)-1
Result:
-1.1102230246251565E-16
This differed from the expected result:
0.0
********************** Problem 197 ***************
Input:
float((2^1000-1)/2^1000)-1
Result:
-1.1102230246251565E-16
This differed from the expected result:
0.0

These seem to be due to the version of gcc used to compile gcl.  They 
don't occur with gcc-4.6 (but this has other issues).