limit reported disk space to 1GB, take 2

[Dan Kegel]

This patch gets Lotus SmartSuite for Windows 3.1
to install, and is less hacky than my last try.
That app, and probably many other win16 apps,
refuses to install if the reported disk space is
unexpected larger than the disks that were common back then.

I tested conformance with a little test app that calls
int21/ah=36h and prints out the results in hex.
The test program and results on several drives
are attached to
http://bugs.winehq.org/show_bug.cgi?id=5711

Changelog:
  winedos/int21.c: limit disk space reported by ah=36h to 1GB

 int21.c |   55 ++++++++++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 52 insertions(+), 3 deletions(-)
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