Only include in the crate vendored files that are required

Otherwise, the crate becomes very large.

Cargo.toml

@@ -1,7 +1,11 @@
 [package]
 name = "sundials-sys"
 version = "0.4.0"
-authors = ["Jason Dark <[email protected]>", "Arthur Carcano <[email protected]>", "Christophe Troestler <[email protected]>" ]
+authors = [
+  "Jason Dark <[email protected]>",
+  "Arthur Carcano <[email protected]>",
+  "Christophe Troestler <[email protected]>"
+]
 edition = "2021"
 links = "sundials"
 
@@ -11,7 +15,8 @@ repository = "https://github.com/Chris00/sundials-sys"
 license = "BSD-3-Clause"
 readme = "README.md"
 keywords = ["ode", "numerics", "ffi", "math", "simulation"]
-exclude = ["**/*.pdf","vendor/examples"]
+exclude = ["**/*.pdf", "vendor/benchmarks", "vendor/doc",
+  "vendor/examples", "vendor/test"]
 
 [build-dependencies]
 bindgen = "0.68"