Add 1989/ovdluhe/try.sh and fix Makefile

The try.sh script runs the program on the source file, the README.md and
the Makefile in a loop that runs four times. It has one loop so that
there is a better chance that it won't show the same output on the same
file more than once though it's certainly possible that it will.

The optimiser had been left disabled by accident and this has been
restored.

1989/ovdluhe/try.sh

@@ -0,0 +1,34 @@
+#!/usr/bin/env bash
+#
+# try.sh - demonstrate IOCCC winner 1989/ovdluhe
+#
+
+# make sure CC is set so that when we do make CC="$CC" it isn't empty. Doing it
+# this way allows us to have the user specify a different compiler in an easy
+# way.
+if [[ -z "$CC" ]]; then
+    CC="cc"
+fi
+
+make CC="$CC" all >/dev/null || exit 1
+
+# clear screen after compilation so that only the entry is shown
+clear
+
+i=0
+for ((i=0; i<4; ++i)); do
+    read -r -n 1 -p "Press any key to run: ./ovdluhe < ovdluhe.c: "
+    echo 1>&2
+    ./ovdluhe < ovdluhe.c
+    echo 1>&2
+
+    read -r -n 1 -p "Press any key to run: ./ovdluhe < README.md: "
+    echo 1>&2
+    ./ovdluhe < README.md
+    echo 1>&2
+
+    read -r -n 1 -p "Press any key to run: ./ovdluhe < Makefile: "
+    echo 1>&2
+    ./ovdluhe < Makefile
+    echo 1>&2
+done