Windows-related build fixes

[yaleman]

It builds, but kanidmd stack-overflows on windows while running initialise_helper, something something DB-related-things, by the looks of it?

It wasn't compiling at all before the PR changes, so I didn't make it worse 😃

Relates to #1229

• cargo fmt has been run
• cargo clippy has been run
• cargo test has been run and passes

PS C:\Users\yaleman\Projects\kanidm\kanidmd\daemon> cargo run --bin kanidmd server --config C:\Users\yaleman\AppData\Local\Temp\kanidm\server.toml
    Finished dev [unoptimized + debuginfo] target(s) in 0.52s
     Running `C:\Users\yaleman\Projects\kanidm\target\debug\kanidmd.exe server --config C:\Users\yaleman\AppData\Local\Temp\kanidm\server.toml`
Running on windows, current username is: "yaleman"
Running in server mode ...
WARNING: permissions checks on windows aren't implemented, cannot check TLS Key at "C:/Users/yaleman/AppData/Local/Temp/kanidm/chain.pem" 
WARNING: permissions checks on windows aren't implemented, cannot check TLS Key at "C:/Users/yaleman/AppData/Local/Temp/kanidm/key.pem"   
00000000-0000-0000-0000-000000000000 INFO     ｉ [info]: Starting kanidm with configuration:  address: 127.0.0.1:8443, domain: localhost, 
ldap address: 127.0.0.1:3636, thread count: 16, dbpath: C:/Users/yaleman/AppData/Local/Temp/kanidm/kanidm.db, arcsize: AUTO, max request size: 262144b, secure cookies: true, trust X-Forwarded-For: false, with TLS: true, online_backup: enabled, role: write replica, integration mode: false, console output format: Text
Creating QS
Created QS
Helper starting

thread 'main' has overflowed its stack
error: process didn't exit successfully: `C:\Users\yaleman\Projects\kanidm\target\debug\kanidmd.exe server --config C:\Users\yaleman\AppData\Local\Temp\kanidm\server.toml` (exit code: 0xc00000fd, STATUS_STACK_OVERFLOW)

[Firstyear]

Good start! I can help investigate the issue with the segfault later :)

[yaleman]

WOooooooOooOooo all the tests pass! 🥳