launchpad is not part of the sysroot anymore.

Change-Id: I4d4d2c651579fcb84eb55f7e466680400f5e319c
diff --git a/BUILD.gn b/BUILD.gn
index 0ad2fbb..6137e06 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -333,10 +333,10 @@
   deps = [
     "libutf",
     "libutil",
+    "//zircon/public/lib/launchpad",
   ]
 
   libs = [
-    "launchpad",
     "zircon",
   ]