Update libsrtp to version 2.0

include/getopt_s.h

Index: include/getopt_s.h
diff --git a/srtp/include/getopt_s.h b/include/getopt_s.h
similarity index 96%
rename from srtp/include/getopt_s.h
rename to include/getopt_s.h
index 2a6ece34ebc1f4c663bf9159a29d6c78cde7177a..584d54ccfabf72edb0348e7c7eff62fff113c92e 100644
--- a/srtp/include/getopt_s.h
+++ b/include/getopt_s.h
@@ -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 */