Adding upstream version 2:9.1.1230.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

runtime/tools/blink.c

@@ -0,0 +1,24 @@
+/*
+ * An extremely simple program to make the cursor blink in an xterm.
+ * This is useful when the cursor is hard to spot in a highlighted file.
+ * Start in the background: "blink&"  Stop by killing it.
+ * Bram Moolenaar  980109  (based on an idea from John Lange).
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+
+	int
+main(void)
+{
+	while (1)
+	{
+		printf("\e[?25h");
+		fflush(stdout);
+		usleep(400000);		/* on time */
+		printf("\e[?25l");
+		fflush(stdout);
+		usleep(250000);		/* off time */
+	}
+	return 0;
+}