Remove testing_only_libclang_4 and expectations

Cargo.toml

@@ -83,4 +83,3 @@ testing_only_docs = []
 testing_only_extra_assertions = []
 testing_only_libclang_9 = []
 testing_only_libclang_5 = []
-testing_only_libclang_4 = []

bindgen-integration/Cargo.toml

@@ -18,4 +18,3 @@ testing_only_docs = ["bindgen/testing_only_docs"]
 testing_only_extra_assertions = ["bindgen/testing_only_extra_assertions"]
 testing_only_libclang_9 = ["bindgen/testing_only_libclang_9"]
 testing_only_libclang_5 = ["bindgen/testing_only_libclang_5"]
-testing_only_libclang_4 = ["bindgen/testing_only_libclang_4"]

src/main.rs

@@ -23,8 +23,6 @@ fn clang_version_check() {
         Some((9, 0))
     } else if cfg!(feature = "testing_only_libclang_5") {
         Some((5, 0))
-    } else if cfg!(feature = "testing_only_libclang_4") {
-        Some((4, 0))
     } else {
         None
     };

tests/expectations/build.rs

@@ -9,7 +9,6 @@ use std::io::Write;
 use std::path::Path;
 
 const LIBCLANG_VERSION_DIRS: &'static [&'static str] = &[
-    "libclang-4",
     "libclang-5",
     "libclang-9",
 ];