Change source. Other modifications.

Upstream wine-staging hosted at
'https://github.com/wine-compholio/wine-staging/' is no more
maintained. A community fork is now maintained at
'https://github.com/wine-staging/wine-staging/'. This fork was
received by mainstream Arch Linux in it's official repositories
in the stable wine-staging package, so it seems to be safe to
use it here too. Probably other mainstream Linux distributions
will follow this fork too, like Gentoo.

Other modifications on this commit:
-----------------------------------
- added freetype harmony fix
- added wine binfmt
- makedepends: added {lib32-}vulkan-icd-loader and {lib32-}sdl2
- optdepends : added {lib32-}sdl2
- optdepends : removed {lib32-}libtxc_dxtn

Note:
-----
libtxc_dxtn is now integrated into mesa. Packages libtxc_dxtn and
lib32-libtxc_dxtn were dropped from the official repositories.

References:
-----------
https://wine-staging.com/news/2018-02-17-future-wine-staging.html
https://www.winehq.org/pipermail/wine-devel/2018-February/122848.html
https://www.winehq.org/pipermail/wine-devel/2018-February/123080.html
https://git.archlinux.org/svntogit/community.git/commit/trunk?h=packages/wine-staging&id=1a48e921ac7aa7f9c622f20e384e14324a609fa3
https://lists.freedesktop.org/archives/mesa-dev/2017-October/171265.html
https://cgit.freedesktop.org/mesa/mesa/commit/?id=04396a134f003aece573df593acfa1ab4418ffe8
https://cgit.freedesktop.org/mesa/mesa/commit/?id=f7daa737d17df6d0a847e5c61e48d25e598671f4
https://cgit.freedesktop.org/mesa/mesa/commit/?id=d400348c73f0901eb24ff4d1562043d3119ef439
https://bugs.archlinux.org/task/56660
https://git.archlinux.org/svntogit/packages.git/commit/trunk?h=packages/mesa&id=8b2dc9909803d680f67bb3d559d3e1c0a5f1e2ec

1 files changed, 2 insertions, 0 deletions

diff --git a/wine-binfmt.conf b/wine-binfmt.conf
new file mode 100644
index 000000000000..4d4307336587
--- /dev/null
+++ b/wine-binfmt.conf
@@ -0,0 +1,2 @@
+# Start WINE on Windows executables
+:DOSWin:M::MZ::/usr/bin/wine: