WebEngine fails on windows due to relative path length exceeding 256 characters

moc_enginioqmlreply_p.cpp
	link /NOLOGO /DYNAMICBASE /NXCOMPAT /DEBUG /DLL /SUBSYSTEM:WINDOWS /OUT:..\..\qml\Enginio\enginioplugind.dll @C:\Users\stathis\AppData\Local\Temp\nmBD69.tmp
   Creating library ..\..\qml\Enginio\enginioplugind.lib and object ..\..\qml\Enginio\enginioplugind.exp
	cd qtwebengine\ && ( if not exist Makefile E:\opensource\qt-everywhere-opensource-src-5.4.2-build-vs2013\qt5-x86-shared-d\qtbase\bin\qmake E:\opensource\qt-everywhere-opensource-src-5.4.2\qtwebengine\qtwebengine.pro -o Makefile ) && D:\dev\vs2013\VC\BIN\nmake.exe -f Makefile
Info: creating cache file E:\opensource\qt-everywhere-opensource-src-5.4.2-build-vs2013\qt5-x86-shared-d\qtwebengine\.qmake.cache
Running configure tests
Checking for libcap... no

Microsoft (R) Program Maintenance Utility Version 12.00.21005.1
Copyright (C) Microsoft Corporation.  All rights reserved.

	cd src\ && ( if not exist Makefile E:\opensource\qt-everywhere-opensource-src-5.4.2-build-vs2013\qt5-x86-shared-d\qtbase\bin\qmake E:\opensource\qt-everywhere-opensource-src-5.4.2\qtwebengine\src\src.pro -o Makefile ) && D:\dev\vs2013\VC\BIN\nmake.exe -f Makefile

Microsoft (R) Program Maintenance Utility Version 12.00.21005.1
Copyright (C) Microsoft Corporation.  All rights reserved.

	cd core\ && ( if not exist Makefile E:\opensource\qt-everywhere-opensource-src-5.4.2-build-vs2013\qt5-x86-shared-d\qtbase\bin\qmake E:\opensource\qt-everywhere-opensource-src-5.4.2\qtwebengine\src\core\core.pro -o Makefile ) && D:\dev\vs2013\VC\BIN\nmake.exe -f Makefile

Microsoft (R) Program Maintenance Utility Version 12.00.21005.1
Copyright (C) Microsoft Corporation.  All rights reserved.

	( if not exist Makefile.core_gyp_generator E:\opensource\qt-everywhere-opensource-src-5.4.2-build-vs2013\qt5-x86-shared-d\qtbase\bin\qmake E:\opensource\qt-everywhere-opensource-src-5.4.2\qtwebengine\src\core\core_gyp_generator.pro -o Makefile.core_gyp_generator ) && D:\dev\vs2013\VC\BIN\nmake.exe -f Makefile.core_gyp_generator

Microsoft (R) Program Maintenance Utility Version 12.00.21005.1
Copyright (C) Microsoft Corporation.  All rights reserved.

	D:\dev\vs2013\VC\BIN\nmake.exe -f Makefile.core_gyp_generator.Debug

Microsoft (R) Program Maintenance Utility Version 12.00.21005.1
Copyright (C) Microsoft Corporation.  All rights reserved.

	( if not exist Makefile.gyp_run E:\opensource\qt-everywhere-opensource-src-5.4.2-build-vs2013\qt5-x86-shared-d\qtbase\bin\qmake E:\opensource\qt-everywhere-opensource-src-5.4.2\qtwebengine\src\core\gyp_run.pro -o Makefile.gyp_run ) && D:\dev\vs2013\VC\BIN\nmake.exe -f Makefile.gyp_run
using python: D:\dev\python\python.exe version: 2.7.8
Using extra options found in e:\opensource\qt-everywhere-opensource-src-5.4.2\qtwebengine\src\core\qtwebengine_extras.gypi
Updating projects from gyp files...
Traceback (most recent call last):
  File "E:/opensource/qt-everywhere-opensource-src-5.4.2/qtwebengine/tools/buildscripts/gyp_qtwebengine", line 167, in <module>
    sys.exit(gyp.main(args))
  File "e:\opensource\qt-everywhere-opensource-src-5.4.2\qtwebengine\src\3rdparty\chromium\tools\gyp\pylib\gyp\__init__.py", line 527, in main
    return gyp_main(args)
  File "e:\opensource\qt-everywhere-opensource-src-5.4.2\qtwebengine\src\3rdparty\chromium\tools\gyp\pylib\gyp\__init__.py", line 512, in gyp_main
    generator.GenerateOutput(flat_list, targets, data, params)
  File "e:\opensource\qt-everywhere-opensource-src-5.4.2\qtwebengine\src\3rdparty\chromium\tools\gyp\pylib\gyp\generator\ninja.py", line 2282, in GenerateOutput
    config_name)
  File "e:\opensource\qt-everywhere-opensource-src-5.4.2\qtwebengine\src\3rdparty\chromium\tools\gyp\pylib\gyp\generator\ninja.py", line 2204, in GenerateOutputForConfig
    with OpenOutput(os.path.join(toplevel_build, output_file)) as ninja_file:
  File "e:\opensource\qt-everywhere-opensource-src-5.4.2\qtwebengine\src\3rdparty\chromium\tools\gyp\pylib\gyp\generator\ninja.py", line 1628, in OpenOutput
    return open(path, mode)
IOError: [Errno 2] No such file or directory: 'e:/opensource/qt-everywhere-opensource-src-5.4.2/qtwebengine\\..\\..\\qt-everywhere-opensource-src-5.4.2-build-vs2013\\qt5-x86-shared-d\\qtwebengine\\src\\core\\Release\\obj\\src\\3rdparty\\chromium\\third_party\\WebKit\\Source\\bindings\\core\\v8\\bindings_core_v8_generated_aggregate.ninja'
Project MESSAGE: Running gyp_qtwebengine "E:/opensource/qt-everywhere-opensource-src-5.4.2-build-vs2013/qt5-x86-shared-d/qtwebengine/src/core" -D qt_cross_compile=0 -D qt_os="win32" -I config/windows.gypi -D qtwe_chromium_obj_dir="E:/opensource/qt-everywhere-opensource-src-5.4.2-build-vs2013/qt5-x86-shared-d/qtwebengine/src/core/Debug/obj/src/3rdparty/chromium" -D perl_exe="perl.exe" -D bison_exe="bison.exe" -D gperf_exe="gperf.exe" --no-parallel -D qt_gl="opengl" -D disable_nacl=1 -D remoting=0 -D use_ash=0 -D disable_glibcxx_debug=1 -D remove_webcore_debug_symbols=1 -D target_arch=ia32...
Project ERROR: -- running gyp_qtwebengine failed --
NMAKE : fatal error U1077: '(' : return code '0x3'
Stop.
NMAKE : fatal error U1077: 'cd' : return code '0x2'
Stop.
NMAKE : fatal error U1077: 'cd' : return code '0x2'
Stop.
NMAKE : fatal error U1077: 'cd' : return code '0x2'
Stop.