Build script not needed for published crate

Author: dtolnay

gen/build/Cargo.toml

@@ -6,6 +6,7 @@ edition = "2018"
 license = "MIT OR Apache-2.0"
 description = "C++ code generator for integrating `cxx` crate into a Cargo build."
 repository = "https://github.com/dtolnay/cxx"
+exclude = ["build.rs"]
 keywords = ["ffi"]
 categories = ["development-tools::ffi"]
 

gen/cmd/Cargo.toml

@@ -6,6 +6,7 @@ edition = "2018"
 license = "MIT OR Apache-2.0"
 description = "C++ code generator for integrating `cxx` crate into a non-Cargo build."
 repository = "https://github.com/dtolnay/cxx"
+exclude = ["build.rs"]
 keywords = ["ffi"]
 categories = ["development-tools::ffi"]
 

gen/lib/Cargo.toml

@@ -6,6 +6,7 @@ edition = "2018"
 license = "MIT OR Apache-2.0"
 description = "C++ code generator for integrating `cxx` crate into higher level tools."
 repository = "https://github.com/dtolnay/cxx"
+exclude = ["build.rs"]
 keywords = ["ffi"]
 categories = ["development-tools::ffi"]
 

macro/Cargo.toml

@@ -6,7 +6,7 @@ edition = "2018"
 license = "MIT OR Apache-2.0"
 description = "Implementation detail of the `cxx` crate."
 repository = "https://github.com/dtolnay/cxx"
-exclude = ["README.md"]
+exclude = ["build.rs", "README.md"]
 keywords = ["ffi"]
 categories = ["development-tools::ffi"]