Bump llvm-sys to version 14

Author: alessandrod

Cargo.toml

@@ -15,7 +15,7 @@ libloading = "0.5"
 lazy_static = "1.0"
 failure = "0.1"
 libc = "0.2"
-llvm-sys = { version = "120", features = ["no-llvm-linking", "disable-alltargets-init"] }
+llvm-sys = { version = "140", features = ["no-llvm-linking", "disable-alltargets-init"] }
 
 [build-dependencies]
 cargo_metadata = "0.8"