ring_buffer: remove unused APIs flb_ring_buffer_peek/flb_ring_buffer_seek.

Signed-off-by: Phillip Adair Stewart Whelan <phillip.whelan@chronosphere.io>

Author: pwhelan

src/flb_ring_buffer.c

@@ -201,27 +201,3 @@ int flb_ring_buffer_read(struct flb_ring_buffer *rb, void *ptr, size_t size)
 
     return 0;
 }
-
-int flb_ring_buffer_peek(struct flb_ring_buffer *rb, void *ptr, size_t size)
-{
-    size_t ret;
-
-    ret = lwrb_peek(rb->ctx, ptr, size);
-    if (ret == 0) {
-        return -1;
-    }
-
-    return 0;
-}
-
-int flb_ring_buffer_skip(struct flb_ring_buffer *rb, size_t size)
-{
-    size_t ret;
-
-    ret = lwrb_skip(rb->ctx, size);
-    if (ret == 0) {
-        return -1;
-    }
-
-    return 0;
-}