GetDiskFreeSpace fix.

[Rein Klazes]

Hi,

Bug #2506: On win3.x thru winME GetDiskFreeSpace  will not only cap the
total size to be less then 2 GB but also adjust the number of clusters
to be always less the 65535 by changing the sectors-per-cluster value. I
have verified this on Win95 and WinME.

Bug #751: this capping and adjusting just does not seem to happen on
WinNT4.0, Win2k or WinXP.

Changelog:

dlls/kernel	: volume.c
dlls/kernel/tests	: drive.c

In GetDiskFreeSpace:
- only cap the total size and available size to 2GB in Win3.x thru
WinME;
- in that case adjust number of clusters to be less then 65536 by
increasing the cluster size;
- add corresponding tests.

Rein. 
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