Bug 40202: Use constant placeholder for pom file

tools/gen_gradle_deps_file.sh

@@ -51,7 +51,13 @@ while read line
 do
   wget -U "" $line
   fn=$(basename "$line")
-  sha256=`sha256sum $fn | cut -d ' ' -f 1`
+  if ! echo "$fn" | grep -q '\.pom$'; then
+      sha256=`sha256sum $fn | cut -d ' ' -f 1`
+  else
+      # Add placeholder for .pom files. The hashes of .pom files are not checked
+      # when the file is downloaded. See bug 40163.
+      sha256="****************************************************************"
+  fi
   echo "$sha256 | $line" >> deps
   rm $fn
 done < dl-attempts