clean up feature usage

Cargo.toml

@@ -13,29 +13,12 @@ rust-version = "1.65"
 
 [features]
 default = ["bz2", "lzma", "xz", "gz", "bgz", "zstd"]
-bz2 = ["bzip2"]
-lzma = ["liblzma"]
-gz = ["flate2"]
-bgz = ["bgzip"]
+bz2 = ["dep:bzip2", "bzip2?/tokio", "bzip2?/static"]
+lzma = ["dep:liblzma", "liblzma?/tokio"]
+gz = ["dep:flate2", "flate2?/zlib", "flate2?/zlib-ng-compat", "flate2?/cloudflare_zlib", "flate2?/rust_backend"]
+bgz = ["dep:bgzip"]
 xz = ["lzma"]
 
-# bzip2 feature transitivity
-bz2_tokio = ["bzip2/tokio"]
-bz2_static = ["bzip2/static"]
-
-# lzma feature transitivity
-lzma_tokio = ["liblzma/tokio"]
-
-# flate2 feature transitivity
-gz_zlib = ["flate2/zlib"]
-gz_zlib-ng-compat = ["flate2/zlib-ng-compat"]
-gz_cloudflare_zlib = ["flate2/cloudflare_zlib"]
-gz_rust_backend = ["flate2/rust_backend"]
-
-# xz feature transitivity
-xz_tokio = ["liblzma/tokio"]
-
-
 [dependencies]
 cfg-if = "1.0"
 thiserror = "1.0"
@@ -71,22 +54,6 @@ required-features = ["xz2"]
 
 [package.metadata.cargo-all-features]
 denylist = [
-  # bzip2 feature transitivity
-  "bz2_tokio",
-  "bz2_static",
-
-  # lzma feature transitivity
-  "lzma_tokio",
-
-  # flate2 feature transitivity
-  "gz_zlib",
-  "gz_zlib-ng-compat",
-  "gz_cloudflare_zlib",
-  "gz_rust_backend",
-
-  # xz feature transitivity
-  "xz_tokio",
-
   # xz is an alias to lzma
   "xz",
 ]