add a very crude progress report for lossless

better than nothing. Removed the warning in cwebp.c
(and silenced the warning in quiet mode too)

Change-Id: I85bbeaf77e0f60ead798886043dc053e6b44def5
diff --git a/examples/cwebp.c b/examples/cwebp.c
index d94ac53..1458926 100644
--- a/examples/cwebp.c
+++ b/examples/cwebp.c
@@ -1049,7 +1049,7 @@
 
   // Check for unsupported command line options for lossless mode and log
   // warning for such options.
-  if (config.lossless == 1) {
+  if (!quiet && config.lossless == 1) {
     if (config.target_size > 0 || config.target_PSNR > 0) {
       fprintf(stderr, "Encoding for specified size or PSNR is not supported"
                       " for lossless encoding. Ignoring such option(s)!\n");
@@ -1058,10 +1058,6 @@
       fprintf(stderr, "Partition limit option is not required for lossless"
                       " encoding. Ignoring this option!\n");
     }
-    if (show_progress) {
-      fprintf(stderr, "Progress reporting option is not supported for lossless"
-                      " encoding. Ignoring this option!\n");
-    }
   }
 
   if (!WebPValidateConfig(&config)) {