[cmake/win32] fixes for building with abnormal configuration

[Kwiboo]

Description

Building fails (on windows) when version tag is empty, app name is changed or when optical/upnp/airtunes is disabled

Motivation and Context

Fixes building of abnormal configuration on windows

How Has This Been Tested?

Compile tested with cmake 3.6.3 and visual studio 2015 on windows 10

Screenshots (if appropriate):

Types of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the Code guidelines of this project
• My change requires a change to the documentation, either Doxygen or wiki
• I have updated the documentation accordingly
• I have read the CONTRIBUTING document
• I have added tests to cover my change
• All new and existing tests passed

[hudokkow]

Thanks for looking into this. CMake changes look sane. As for the rest, we need an win dev.

ping @Paxxi
jenkins build this please

[razzeee]

jenkins build failed last time with this PR.
Let's do it again and see why.
jenkins build this please

[Kwiboo]

If it helps any review of this PR:
HAS_AIRTUNES and HAS_UPNP removed from xbmc/system.h is defined earlier in the same file depending on cmake config and should not cause any changes in defines with normal cmake config.
HAS_AUDIO was removed because I could not find it used anywhere inside Kodi: https://github.com/xbmc/xbmc/search?q=HAS_AUDIO

[hudokkow]

Anyone has a reason not to merge this? If so, speak in the next 24h or I'll push it in.
@afedchin, do you have time for a quick look?

[afedchin]

what should I take a look on? I know nothing about cmake.

[hudokkow]

The ifdeferry? It's not a CMake invention... ;)

[Kwiboo]

Rebased and a moved ifdef in CDetectDisc::DoWork()

Completely removing CDetectDisc was a rather obtrusive change as it also required ifdef in https://github.com/xbmc/xbmc/blob/master/xbmc/windowing/windows/WinEventsWin32.cpp#L790 so I just moved the ifdef in CDetectDisc::DoWork()

[MartijnKaijser]

jenkins build this please
any further comments/objections?

[Paxxi]

Looks good to me

[hudokkow]

jenkins build and merge