FS-9785: upgrade libsrtp to 2.1

libs/srtp/include/getopt_s.h

@@ -8,7 +8,7 @@
  */
 /*
  *	
- * Copyright (c) 2001-2006 Cisco Systems, Inc.
+ * Copyright (c) 2001-2017 Cisco Systems, Inc.
  * All rights reserved.
  * 
  * Redistribution and use in source and binary forms, with or without
@@ -45,6 +45,10 @@
 #ifndef GETOPT_S_H
 #define GETOPT_S_H
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /* 
  * getopt_s(), optarg_s, and optind_s are small, locally defined
  * versions of the POSIX standard getopt() interface.
@@ -57,4 +61,8 @@ extern char *optarg_s;    /* defined in getopt.c */
 
 extern int optind_s;      /* defined in getopt.c */
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* GETOPT_S_H */