Absolutify paths to platform/.

Source/core/css/makeprop.pl

 #! /usr/bin/perl
 #
 #   This file is part of the WebKit project
 #
 #   Copyright (C) 1999 Waldo Bastian (bastian@kde.org)
 #   Copyright (C) 2007, 2008, 2012 Apple Inc. All rights reserved.
 #   Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
 #   Copyright (C) 2010 Andras Becsi (abecsi@inf.u-szeged.hu), University of Szeged
 #
 #   This library is free software; you can redistribute it and/or
@@ skipping 48 matching lines @@
 if (@duplicates > 0) {
     die 'Duplicate CSS property names: ', join(', ', @duplicates) . "\n";
 }
 
 open GPERF, ">CSSPropertyNames.gperf" || die "Could not open CSSPropertyNames.gperf for writing";
 print GPERF << "EOF";
 %{
 /* This file is automatically generated from CSSPropertyNames.in by makeprop, do not edit */
 #include "config.h"
 #include \"CSSPropertyNames.h\"
-#include \"HashTools.h\"
+#include \"core/platform/HashTools.h\"
 #include <string.h>
 
 #include <wtf/ASCIICType.h>
 #include <wtf/text/AtomicString.h>
 #include <wtf/text/WTFString.h>
 
 namespace WebCore {
 EOF
 
 print GPERF "const char* const propertyNameStrings[numCSSProperties] = {\n";
@@ skipping 168 matching lines @@
 }
 
 #endif // CSSPropertyNames_h
 
 EOF
 
 close HEADER;
 
 my $gperf = $ENV{GPERF} ? $ENV{GPERF} : "gperf";
 system("\"$gperf\" --key-positions=\"*\" -D -n -s 2 CSSPropertyNames.gperf --output-file=CSSPropertyNames.cpp") == 0 || die "calling gperf failed: $?";