Fixes a spelling error.

Author: Chris Taylor <ctaylor@debian.org>
--- a/nuttcp-6.1.2.c
+++ b/nuttcp-6.1.2.c
@@ -5894,7 +5894,7 @@ getoptvalp( char **argv, int index, int 
 #define NETSTAT			"netstat"
 
 #if defined(linux)
-#define RETRANS			"segments retransmited"
+#define RETRANS			"segments retransmitted"
 #define NETSTAT_DIR		"/bin/"
 #define NRETRANS_BEFORE
 #elif defined(__FreeBSD__)
