llvm-tools-preview: fix build-manifest

Author: japaric

src/tools/build-manifest/src/main.rs

@@ -492,7 +492,7 @@ impl Builder {
             format!("clippy-{}-{}.tar.gz", self.clippy_release, target)
         } else if component == "rustfmt" || component == "rustfmt-preview" {
             format!("rustfmt-{}-{}.tar.gz", self.rustfmt_release, target)
-        } else if component == "llvm_tools" {
+        } else if component == "llvm-tools" || component == "llvm-tools-preview" {
             format!("llvm-tools-{}-{}.tar.gz", self.llvm_tools_release, target)
         } else {
             format!("{}-{}-{}.tar.gz", component, self.rust_release, target)