Remove explicit linkage include in tests.

I guess brotlicommon-static has already been a static library so we don't need that.

Test this later on Windows.

tests/harfbuzz/build.rs

@@ -8,7 +8,6 @@ fn main() {
     // 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.)
-    println!("cargo:rustc-link-lib=brotlicommon-static");
 
     let mut build = cc::Build::new();
     build.file("src/test.c");