issue with building with VS2017

[jameysiddiqui]

c:\users\administrator\downloads\perl-tk-master\ptk\Lang.h(29): warning C4117: macro name 'FUNCTION' is reserved, '#define' ignored
C:\Program Files (x86)\Windows Kits\10\include\10.0.17763.0\um\winnt.h(20580): error C2059: syntax error: 'constant'
C:\Program Files (x86)\Windows Kits\10\include\10.0.17763.0\um\winnt.h(20592): error C2059: syntax error: '}'
C:\Program Files (x86)\Windows Kits\10\include\10.0.17763.0\um\winnt.h(20593): error C2059: syntax error: '}'
C:\Program Files (x86)\Windows Kits\10\include\10.0.17763.0\um\winnt.h(20594): error C2143: syntax error: missing '{' before ''
C:\Program Files (x86)\Windows Kits\10\include\10.0.17763.0\um\winnt.h(20602): error C2061: syntax error: identifier 'IMAGE_POLICY_ENTRY'
C:\Program Files (x86)\Windows Kits\10\include\10.0.17763.0\um\winnt.h(20603): error C2059: syntax error: '}'
C:\Program Files (x86)\Windows Kits\10\include\10.0.17763.0\um\winnt.h(20604): error C2143: syntax error: missing '{' before ''
C:\Program Files (x86)\Windows Kits\10\include\10.0.17763.0\um\processthreadsapi.h(1032): error C2059: syntax error: 'constant'
C:\Program Files (x86)\Windows Kits\10\include\10.0.17763.0\um\processthreadsapi.h(1034): error C2059: syntax error: '}'
C:\Program Files (x86)\Windows Kits\10\include\10.0.17763.0\um\processthreadsapi.h(1151): error C2059: syntax error: 'constant'
C:\Program Files (x86)\Windows Kits\10\include\10.0.17763.0\um\processthreadsapi.h(1153): error C2059: syntax error: '}'
NMAKE : fatal error U1077: '"C:\Program Files (x86)\Microsoft Visual Studio\2017\BuildTools\VC\Tools\MSVC\14.16.27023\bin\HostX64\x64\cl.EXE"' : return code '0x2'
Stop.
NMAKE : fatal error U1077: 'cd' : return code '0x2'
Stop.

[chrstphrchvz]

This issue is due to conflicting definitions of None and ControlMask. It would be resolved by the gh-87 branch (see #89).