Replace tempdir by tempfile in librustc

This removes the last dependency on tempdir.

Author: Eijebong

src/Cargo.lock

@@ -1800,7 +1800,7 @@ dependencies = [
  "serialize 0.0.0",
  "syntax 0.0.0",
  "syntax_pos 0.0.0",
- "tempdir 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tempfile 3.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -2831,15 +2831,6 @@ dependencies = [
  "xattr 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "tempdir"
-version = "0.3.7"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "rand 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "remove_dir_all 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "tempfile"
 version = "3.0.2"
@@ -3380,7 +3371,6 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum syntex_pos 0.52.0 (registry+https://github.com/rust-lang/crates.io-index)" = "955ef4b16af4c468e4680d1497f873ff288f557d338180649e18f915af5e15ac"
 "checksum syntex_syntax 0.52.0 (registry+https://github.com/rust-lang/crates.io-index)" = "76a302e717e348aa372ff577791c3832395650073b8d8432f8b3cb170b34afde"
 "checksum tar 0.4.15 (registry+https://github.com/rust-lang/crates.io-index)" = "6af6b94659f9a571bf769a5b71f54079393585ee0bfdd71b691be22d7d6b1d18"
-"checksum tempdir 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)" = "15f2b5fb00ccdf689e0149d1b1b3c03fead81c2b37735d812fa8bddbbf41b6d8"
 "checksum tempfile 3.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "47776f63b85777d984a50ce49d6b9e58826b6a3766a449fc95bc66cd5663c15b"
 "checksum tendril 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "9de21546595a0873061940d994bbbc5c35f024ae4fd61ec5c5b159115684f508"
 "checksum term 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)" = "fa63644f74ce96fbeb9b794f66aff2a52d601cbd5e80f4b97123e3899f4570f1"

src/librustc/Cargo.toml

@@ -61,6 +61,4 @@ chalk-engine = { version = "0.6.0", default-features=false }
 #        later crate stop compiling. If you can remove this and everything
 #        compiles, then please feel free to do so!
 flate2 = "1.0"
-tempdir = "0.3"
-
-
+tempfile = "3.0"