Add distclean.sh

This should simplify full cleanup when packaging.

The script was slightly modified from the original contribution of
Eriberto to pass shellcheck checks.

Closes baruch#52

distclean.sh

@@ -0,0 +1,46 @@
+#!/bin/sh
+
+# distclean.sh for diskscan
+# Copyright 2015 Joao Eriberto Mota Filho <[email protected]>
+# v2015111402
+# This file can used under GPL-3+ license or BSD-3-Clause.
+
+PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
+
+PREFIX="."
+
+# Files and directories to remove
+
+OBJS="	CMakeFiles/ \
+	Makefile \
+	CMakeCache.txt \
+	Documentation/diskscan.1 \
+	cmake_install.cmake \
+	install_manifest.txt \
+	libscsicmd/src/CMakeFiles/ \
+	libscsicmd/src/Makefile \
+	libscsicmd/src/cmake_install.cmake \
+        tags"
+
+# Main procedures
+
+remove_files () {
+    if [ -e "$PREFIX/$TARGET" ]; then
+        echo "Removing $PREFIX/$TARGET"
+        rm -rf "${PREFIX:?}/$TARGET"
+    else
+        echo "$PREFIX/$TARGET NOT FOUND."
+    fi
+}
+
+# Distclean
+
+echo "DOING DISTCLEAN..."
+
+for TARGET in $OBJS
+do
+    remove_files
+done
+
+echo "DONE."
+echo