test/harfbuzz/build.rs: remove outdated comment

The comment is no longer operative now that the println is gone.

tests/harfbuzz/build.rs

@@ -4,11 +4,6 @@ extern crate vcpkg;
 fn main() {
     let libs = vcpkg::Config::new().find_package("harfbuzz").unwrap();
 
-    // vcpkg-rs is not capable of working out the correct order to link
-    // libraries in. This only matters on Linux at present. (vcpkg itself
-    // does fine, but vcpkg-rs needs to work out how to get the link order
-    // from the it.)
-
     let mut build = cc::Build::new();
     build.file("src/test.c");
     for inc in libs.include_paths {