Attached is an updated patch for the win32/visualc++ specific parts of
my previous patch, not included in the parts applied by Alvaro.
For win32 in general, this makes it possible to run the regression tests
as an admin user by using the same restricted token method that's used
by pg_ctl and initdb.
For vc++, it adds building of pg_regress.exe, adds a resultmap, and
fixes how it runs the install.
//Magnus