<netinet/ip_icmp.h>: ensure struct icmphdr is available.

Needed to build toybox ping.

Bug: N/A
Test: ran tests
Change-Id: Ifd0f0ccbb8351c6a0ece526b050778fd02e984bf
diff --git a/tests/Android.bp b/tests/Android.bp
index 707d0fe..00f2856 100644
--- a/tests/Android.bp
+++ b/tests/Android.bp
@@ -108,6 +108,7 @@
         "net_if_test.cpp",
         "netinet_ether_test.cpp",
         "netinet_in_test.cpp",
+        "netinet_ip_icmp_test.cpp",
         "netinet_udp_test.cpp",
         "nl_types_test.cpp",
         "pthread_test.cpp",