[build][alln] Fix Zircon library dependency.

This small change is required to move the sysroot generation to the
Fuchsia build. This CL depends on [1] being submitted first in the
fuchsia.git repository.

Bug: 60613
Testing: Should not change the build.

[1] https://fuchsia-review.googlesource.com/c/fuchsia/+/433557

Change-Id: I1b84e1563b2272ce810dfafe79999e7d1c9c8b4d
Reviewed-on: https://fuchsia-review.googlesource.com/c/third_party/iperf/+/434757
Reviewed-by: Shai Barack <shayba@google.com>
Reviewed-by: P.Y. Laligand <pylaligand@google.com>
diff --git a/BUILD.gn b/BUILD.gn
index 3e84e4a..9a9fc54 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -107,8 +107,10 @@
     "-Wno-sign-compare",
   ]
   if (is_fuchsia) {
-    libs = [ "zircon" ]
-    deps = [ ":fuchsia-compat" ]
+    deps = [
+      ":fuchsia-compat",
+      "//src/zircon/lib/zircon",
+    ]
   }
 
   # TODO(fxb/58162): delete the below and fix compiler warnings