Fix for core dumps on FreeBSD

Flexi_logger options for async writemode https://github.com/rustdesk/rustdesk-server/pull/232#issuecomment-1491347232

Cargo.toml

@@ -46,7 +46,7 @@ tungstenite = "0.17"
 regex = "1.4"
 tower-http = { version = "0.3", features = ["fs", "trace", "cors"] }
 http = "0.2"
-flexi_logger = { version = "0.22", features = ["async", "use_chrono_for_offset"] }
+flexi_logger = { version = "0.22", features = ["async", "use_chrono_for_offset", "dont_minimize_extra_stacks"] }
 ipnetwork = "0.20"
 local-ip-address = "0.5.1"
 dns-lookup = "1.0.8"