Enable GigPlayer Windows build

[DanWin]

This enables GigPlayer builds for windows.
I had to add the -Wno-deprecated compiler flag to fix a bunch of these errors caused by an include file in the mingw-x-libgig package:
/opt/mingw32/include/gig.h:434:13: error: access declarations are deprecated in favour of using-declarations; suggestion: add the 'using' keyword [-Werror=deprecated]
DLS::Sampler::UnityNote;
^

[tresf]

Thanks @DanWin. What is the SAMPLERATE_LIBRARY_DIRS for exactly?

[DanWin]

@tresf I don't know, seams to work even without, but they were were also in sf2_player, so I just copied it from there.

[DanWin]

Hm, the build is failing, because the package is missing in the ppa. I was using the trusty version of the ppa, not the precise one. We should add the mingw-x-libgig package to the ppa repository before merging.

[DanWin]

@tobydox You should have a look into your ppa, mingw-x-libgig has failed building for precise.

[tresf]

@tobydox You should have a look into your ppa, mingw-x-libgig has failed building for precise.

He's fully aware. It was a wontfix problem last we discussed this (tried digging up the thread to no avail). His recommendation was to move to 14.04. It will also prevent us from deploying 1.2 using Travis. 😕

[tresf]

@lukas-w if you can offer some opinions on this, it would be greatly appreciated. Merging this helps the project but breaks Travis. Sadface.

[lukas-w]

I think the easiest solution would be to fix the libgig package for 12.04. Travis is using 12.04 and we can't change that.
The only alternative I see is migrating to a different CI service. https://semaphoreapp.com offers Ubuntu 14.04.

[tresf]

I think the easiest solution would be to fix the libgig package for 12.04. Travis is using 12.04 and we can't change that.

I'm inclined to agree... Does this fall on Toby, or do we start investigating cross-building and ppa hosting or a mix of the two?

[tobydox]

libgig finally has been built successfully for Precise so you can use it in Travis CI as well.

[lukas-w]

Great, thanks Toby! :)

CMake in Travis can't seem to find libgig:

* GIG player                  : not found, libgig needed for decoding .gig files

[DanWin]

@lukas-w In the first run it isn't found, but on the second run it is, same as libfluidsynth-dev for sf2_player. That's why the windows CMake file is invoked twice. If you scroll down in the travis log, you should actually see:

• GIG player : not found, libgig needed for decoding .gig files (line 438)
  …
• GIG player : OK (line 507)

[lukas-w]

Ah yes, forgot about that, thanks @DanWin