add Issue#727 test cases

test/error_handling/Issue727/exec.c

@@ -0,0 +1,10 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <errno.h>
+int
+main(int argc, char **argv)
+{
+	execlp("ls", "ls", NULL);
+}