benchtests: Add IPv4 inet_ntop benchmark

Random IP addresses in the full range.
Reviewed-by: Collin Funk <collin.funk1@gmail.com>
Reviewed-by: DJ Delorie <dj@redhat.com>

benchtests/inet_ntop_ipv4-source.c

@@ -0,0 +1,10 @@
+#include <arpa/inet.h>
+#include <stdint.h>
+
+static void
+inet_ntop_ipv4 (uint32_t addr)
+{
+  struct in_addr saddr = { .s_addr = addr };
+  char dst[INET_ADDRSTRLEN];
+  inet_ntop (AF_INET, &saddr, dst, sizeof dst);
+}