Exclude GitHub Workflows files from packaged crate

Author: mulkieran

compiler-builtins/libm/Cargo.toml

@@ -10,7 +10,7 @@ readme = "README.md"
 repository = "https://github.com/rust-lang/libm"
 version = "0.2.7"
 edition = "2018"
-exclude = ["/ci/"]
+exclude = ["/ci/", "/.github/workflows/"]
 
 [features]
 default = []