Use a fork of libloading that avoids the segfault when loading clang.

jdm · jdm · commit 723104432500 · 2018-06-18T16:05:26.000-04:00
diff --git a/Cargo.toml b/Cargo.toml
@@ -29,3 +29,6 @@ libz-sys = "1.0"
 [build-dependencies]
 bindgen = "0.36.1"
 cc = "1.0"
+
+[patch.crates-io]
+libloading = { git = "https://github.com/servo/rust_libloading", branch = "mac-crash-revert" }
