Bug 1444097 - Clean up env_logger dependencies. r=ted

For the "js" crate, disable the "regex" feature to reduce binary size.

For the "u2fhid" crate, it's used only in examples. Make it a dev-dependency
so it won't be part of the Firefox build.

MozReview-Commit-ID: DY9indMqrRw

--HG--
extra : rebase_source : aa66fe1effaeca0ae35ec5dd20b33724eb3fac48

Cargo.lock

@@ -1896,7 +1896,6 @@ dependencies = [
  "bitflags 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "boxfnonce 0.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "core-foundation-sys 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "env_logger 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.33 (registry+https://github.com/rust-lang/crates.io-index)",
  "libudev 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",

dom/webauthn/u2f-hid-rs/Cargo.toml

@@ -15,7 +15,6 @@ winapi = "0.2.8"
 [dependencies]
 rand = "0.3"
 log = "0.3"
-env_logger = "0.4.1"
 libc = "^0.2"
 boxfnonce = "0.0.3"
 runloop = "0.1.0"
@@ -24,3 +23,4 @@ bitflags = "1.0"
 [dev-dependencies]
 rust-crypto = "^0.2"
 base64 = "^0.4"
+env_logger = "0.4.1"

js/rust/Cargo.toml

@@ -6,9 +6,9 @@ build = "build.rs"
 license = "MPL-2.0"
 
 [build-dependencies]
-env_logger = "0.4"
+env_logger = {version = "0.4", default-features = false} # disable `regex` to reduce code size
 log = "0.3"
-bindgen = "0.33.1"
+bindgen = {version = "0.33.1", default-features = false} # disable `logging` to reduce code size
 cmake = "0.1"
 glob = "0.2.11"