Revert "New tool: unpragma_once.pl"

This reverts commit c47f196281.

libuavcan/tools/unpragma_once.pl

@@ -1,59 +0,0 @@
-#!/usr/bin/env perl
-###############################################################################
-# Purpose:      Remove all occurrences of "#pragma once" from the source tree.
-# Usage:        "unpragma-once *.h" or "find . -name \*.h | xargs unpragma-once"
-# Author:       Vadim Zeitlin <vadim@tt-solutions.com>
-# Licence:      Free Software released under BSD license
-# Copyright:    (C) 2011 TT-Solutions SARL
-###############################################################################
-# Pavel Kirienko <pavel.kirienko@gmail.com>, 2015:
-#       Include guard naming adapted to UAVCAN coding style.
-###############################################################################
-
-use warnings;
-use strict;
-use autodie;
-
-use File::Copy qw(move);
-use File::Spec ();
-use File::Temp ();
-use IO::Handle;
-
-sub process_single_file
-{
-    my $filename = shift;
-
-    my ($volume, $dir, $basename) = File::Spec->splitpath($filename);
-
-    open my $in, '<', $filename;
-    my $out = File::Temp->new(DIR => $volume . $dir);
-
-    my $guard = '';
-    my $last_was_empty = 0;
-    while (<$in>) {
-        if (/^#pragma\s+once\s+$/) {
-            die "Duplicate #pragma once at $filename:$.\n" if $guard;
-
-            ($guard = uc $filename) =~ s/[\/\.]/_/g;
-            $guard .= "_INCLUDED";
-            print $out "#ifndef $guard\n";
-            print $out "#define $guard\n";
-        }
-        else {
-            $last_was_empty = ($_ =~ /^\s*$/);
-            print $out $_
-        }
-    }
-
-    if ($guard) {
-        print $out "\n" unless $last_was_empty;
-        print $out "#endif // $guard\n";
-
-        $out->flush();
-        move($out->filename, $filename);
-    }
-}
-
-for (@ARGV) {
-    process_single_file $_
-}