Fix:

net_uuid.c:158:5: error: implicit declaration of function 'read' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
net_uuid.c:159:5: error: implicit declaration of function 'close' is invalid in C99 [-Werror,-Wimplicit-function-declaration]

Part of:

https://github.com/HewlettPackard/netperf/commit/0b0cbbef75021134c83be0c3dd21878467e11144
--- src/net_uuid.c.orig
+++ src/net_uuid.c
@@ -29,6 +29,10 @@
 #include <string.h>
 #include <fcntl.h>
 
+#if defined(HAVE_UNISTD_H)
+#include <unistd.h>
+#endif
+
 #if defined(HAVE_INTTYPES_H)
 #include <inttypes.h>
 #endif