[FIXED JENKINS-11073] handle failure to set timestamp on Windows plat…

…forms more gracefully

core/src/main/java/hudson/FilePath.java

@@ -61,8 +61,6 @@
import org.apache.commons.io.input.CountingInputStream;
import org.apache.commons.fileupload.FileItem;
import org.kohsuke.stapler.Stapler;
import org.jvnet.robust_http_client.RetryableHttpStream;

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileFilter;
@@ -1426,7 +1424,17 @@ public void copyToWithPermission(FilePath target) throws IOException, Interrupte
        copyTo(target);
        // copy file permission
        target.chmod(mode());
        target.touch(lastModified());
        
        try {
            target.touch(lastModified());
        } catch (IOException e) {
            // On Windows this seems to fail often. See JENKINS-11073
            if (!isUnix()) {
                LOGGER.warning("Failed to set timestamp on " + target.getRemote());
            } else { // rethrow
                throw new IOException2(e);
            }
        }
    }

    /**