Correct BuildScript.cfgs and BuildScript.linked_libs to be String…

… rather than PathBuf

src/messages.rs

@@ -68,11 +68,11 @@ pub struct BuildScript {
     /// The package this build script execution belongs to
     pub package_id: PackageId,
     /// The libs to link
-    pub linked_libs: Vec<PathBuf>,
+    pub linked_libs: Vec<String>,
     /// The paths to search when resolving libs
     pub linked_paths: Vec<PathBuf>,
     /// Various `--cfg` flags to pass to the compiler
-    pub cfgs: Vec<PathBuf>,
+    pub cfgs: Vec<String>,
     /// The environment variables to add to the compilation
     pub env: Vec<(String, String)>,
     /// The `OUT_DIR` environment variable where this script places its output