Prevent installing crossbeam-channel with default-features="false"

Debouncers used to install `crossbeam-channel`,
due to keeping `notify`'s default features enabled
even if their own default features were disabled.

With this change, `crossbeam-channel` will
no longer be installed if `notify-debouncer-*`
as well as `notify` are installed with
`default-features = false`

Fixes notify-rs#549

notify-debouncer-full/Cargo.toml

@@ -19,12 +19,12 @@ name = "notify_debouncer_full"
 path = "src/lib.rs"
 
 [features]
-default = ["crossbeam"]
+default = ["crossbeam","notify/macos_fsevent"]
 # can't use dep:crossbeam-channel and feature name crossbeam-channel below rust 1.60
 crossbeam = ["crossbeam-channel","notify/crossbeam-channel"]
 
 [dependencies]
-notify = { version = "6.1.1", path = "../notify" }
+notify = { version = "6.1.1", path = "../notify", default-features = false }
 crossbeam-channel = { version = "0.5", optional = true }
 file-id = { version = "0.2.1", path = "../file-id" }
 walkdir = "2.2.2"

notify-debouncer-mini/Cargo.toml

@@ -19,12 +19,12 @@ name = "notify_debouncer_mini"
 path = "src/lib.rs"
 
 [features]
-default = ["crossbeam"]
+default = ["crossbeam","notify/macos_fsevent"]
 # can't use dep:crossbeam-channel and feature name crossbeam-channel below rust 1.60
 crossbeam = ["crossbeam-channel","notify/crossbeam-channel"]
 
 [dependencies]
-notify = { version = "6.1.1", path = "../notify" }
+notify = { version = "6.1.1", path = "../notify", default-features = false }
 crossbeam-channel = { version = "0.5", optional = true }
 serde = { version = "1.0.89", features = ["derive"], optional = true }
 log = "0.4.17"