chore: add vendor dependencies for kauma build

vendor/pkg-config/Cargo.toml

@@ -0,0 +1,42 @@
+# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
+#
+# When uploading crates to the registry Cargo will automatically
+# "normalize" Cargo.toml files for maximal compatibility
+# with all versions of Cargo and also rewrite `path` dependencies
+# to registry (e.g., crates.io) dependencies.
+#
+# If you are reading this file be aware that the original Cargo.toml
+# will likely look very different (and much more reasonable).
+# See Cargo.toml.orig for the original contents.
+
+[package]
+edition = "2018"
+rust-version = "1.31"
+name = "pkg-config"
+version = "0.3.31"
+authors = ["Alex Crichton <alex@alexcrichton.com>"]
+build = false
+autobins = false
+autoexamples = false
+autotests = false
+autobenches = false
+description = """
+A library to run the pkg-config system tool at build time in order to be used in
+Cargo build scripts.
+"""
+documentation = "https://docs.rs/pkg-config"
+readme = "README.md"
+keywords = ["build-dependencies"]
+license = "MIT OR Apache-2.0"
+repository = "https://github.com/rust-lang/pkg-config-rs"
+
+[lib]
+name = "pkg_config"
+path = "src/lib.rs"
+
+[[test]]
+name = "test"
+path = "tests/test.rs"
+
+[dev-dependencies.lazy_static]
+version = "1"