Fix 1992/buzzard.2 alt code, add try scripts

The bug fix is simply so it can compile. It assumed exit(3) returned a
value, not void. The fixes noted in the remarks (though I did not see
them at a quick glance) of the author are not in the alt version (that's
the purpose of it).

The try.sh and try.alt.sh scripts correspond to the entry and the alt
code.

Updated .gitignore.

Added 'first.alt' to Makefile for the try.alt.sh script.

1992/buzzard.2/try.sh

@@ -0,0 +1,34 @@
+#!/usr/bin/env bash
+#
+# try.sh - demonstrate IOCCC winner 1992/buzzard.2
+#
+
+# 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="$CC" all >/dev/null || exit 1
+
+# clear screen after compilation so that only the entry is shown
+clear
+
+echo "$ echo help | cat third help.th - | ./first" 1>&2
+read -r -n 1 -p "Press any key to read help (space = next page, q = quit): "
+echo 1>&2
+echo help | cat third help.th - | ./first | less -rEXF
+
+for i in demo[1-6].th; do
+    # try out each demo
+    #
+    read -r -n 1 -p "Press any key to show $i (space = next page, q = quit): "
+    echo 1>&2
+    less -rEXF "$i"
+    echo 1>&2
+    read -r -n 1 -p "Press any key to run cat third $i | ./first (demo $i): "
+    echo 1>&2
+    cat third "$i" | ./first
+    echo 1>&2
+done