Don't compile `windows` and `windows-sys` in unit test mode (#3112)

crates/libs/sys/Cargo.toml

@@ -11,6 +11,11 @@ readme = "readme.md"
 categories = ["os::windows-apis"]
 exclude = ["features.json"]
 
+[lib]
+# This crate does not contain tests. All tests are in separate crates.
+test = false
+doctest = false
+
 [lints]
 workspace = true
 

crates/libs/windows/Cargo.toml

@@ -13,6 +13,11 @@ readme = "readme.md"
 categories = ["os::windows-apis"]
 exclude = ["features.json"]
 
+[lib]
+# This crate does not contain tests. All tests are in separate crates.
+test = false
+doctest = false
+
 [lints]
 workspace = true