[libc] Fix build after d79156fb

Oops, didn't build correctly, missed some unused variable warnings.

ZX-3307 #comment [libc] Fix build after d79156fb

Test: Manual build
Change-Id: I7c1ade1b9ef7907cdb4f94fd543c852ea7b6f096
diff --git a/BUILD.gn b/BUILD.gn
index f9c4714..9d61159 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -73,4 +73,7 @@
     "-Wno-int-conversion",
     "-Wno-pointer-sign",
   ]
+  libs = [
+    "zircon"
+  ]
 }
diff --git a/src/iperf_api.c b/src/iperf_api.c
index 635e71c..dcd9b61 100755
--- a/src/iperf_api.c
+++ b/src/iperf_api.c
@@ -2738,7 +2738,6 @@
 struct iperf_stream *
 iperf_new_stream(struct iperf_test *test, int s)
 {
-    int i;
     struct iperf_stream *sp;
     
     char template[1024];
diff --git a/src/iperf_util.c b/src/iperf_util.c
index b493ff7..66778ed 100644
--- a/src/iperf_util.c
+++ b/src/iperf_util.c
@@ -62,7 +62,6 @@
 void
 make_cookie(char *cookie)
 {
-    static int randomized = 0;
     char hostname[500];
     struct timeval tv;
     char temp[1000];