Fill out windows PEB definition

[daurnimator]

The PEB has evolved over the lifetime of windows, this PR adds more fields.

[daurnimator]

@andrewrk now with selectable OS version support: how can we customise the PEB for the target?
i.e. how can we write:

struct {
   foo: usize,
   if (version >= 0xABC) {
       bar: usize,
       baz: usize,
       qux: usize,
   } 
};

Options:

• anonymous embedded structs? (Proposal: Support nested anonymous struct and unions. #985)
• usingnamespace could support fields?
• helpers and @reify (builtin function @reify to create a type from a TypeInfo instance #383)

[andrewrk]

how can we customise the PEB for the target?

field_name: VersionCheckedType(T, min_version),

[andrewrk]

Nice - this led to 6fcf671

[daurnimator]

field_name: VersionCheckedType(T, min_version),

And it would return void on non matches?