Add license metadata for std dependencies

Author: clehner

library/alloc/Cargo.toml

@@ -2,6 +2,9 @@
 authors = ["The Rust Project Developers"]
 name = "alloc"
 version = "0.0.0"
+license = "MIT OR Apache-2.0"
+repository = "https://github.com/rust-lang/rust.git"
+description = "The Rust core allocation and collections library"
 autotests = false
 autobenches = false
 edition = "2018"

library/core/Cargo.toml

@@ -2,6 +2,9 @@
 authors = ["The Rust Project Developers"]
 name = "core"
 version = "0.0.0"
+license = "MIT OR Apache-2.0"
+repository = "https://github.com/rust-lang/rust.git"
+description = "The Rust Core Library"
 autotests = false
 autobenches = false
 edition = "2018"

library/panic_abort/Cargo.toml

@@ -2,6 +2,9 @@
 authors = ["The Rust Project Developers"]
 name = "panic_abort"
 version = "0.0.0"
+license = "MIT OR Apache-2.0"
+repository = "https://github.com/rust-lang/rust.git"
+description = "Implementation of Rust panics via process aborts"
 edition = "2018"
 
 [lib]

library/panic_unwind/Cargo.toml

@@ -2,6 +2,9 @@
 authors = ["The Rust Project Developers"]
 name = "panic_unwind"
 version = "0.0.0"
+license = "MIT OR Apache-2.0"
+repository = "https://github.com/rust-lang/rust.git"
+description = "Implementation of Rust panics via stack unwinding"
 edition = "2018"
 
 [lib]

library/unwind/Cargo.toml

@@ -2,6 +2,8 @@
 authors = ["The Rust Project Developers"]
 name = "unwind"
 version = "0.0.0"
+license = "MIT OR Apache-2.0"
+repository = "https://github.com/rust-lang/rust.git"
 edition = "2018"
 include = [
   '/libunwind/*',