zte's code,first commit

Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/lib/libcurl/curl-7.54.1/docs/cmdline-opts/retry-delay.d b/ap/lib/libcurl/curl-7.54.1/docs/cmdline-opts/retry-delay.d
new file mode 100644
index 0000000..43c5aff
--- /dev/null
+++ b/ap/lib/libcurl/curl-7.54.1/docs/cmdline-opts/retry-delay.d
@@ -0,0 +1,11 @@
+long: retry-delay
+arg: <seconds>
+Help: Wait time between retries
+Added: 7.12.3
+---
+Make curl sleep this amount of time before each retry when a transfer has
+failed with a transient error (it changes the default backoff time algorithm
+between retries). This option is only interesting if --retry is also
+used. Setting this delay to zero will make curl use the default backoff time.
+
+If this option is used several times, the last one will be used.