Deploy binaries to GitHub releases (Windows/Linux/MacOS)

[wilzbach]

Basically a copy of dlang-community/D-Scanner#573 which itself is a copy of dlang/dub#1369

(I already configured the environment variables GH_REPO_TOKEN on Travis - it's a bot account and the same we already use for e.g. deploying libdparse's documentation)

[Hackerpilot]

It seems that the .tar.tgz that was attached to the v0.5.0 release of D-Scanner has some issues. I had to manually chmod +x it, and then when I tried to run the executable I got ./dscanner: error while loading shared libraries: libphobos2-ldc-shared.so.78: cannot open shared object file: No such file or directory So it seems that we need to statically link Phobos when making the release executables.

[wilzbach]

It seems that the .tar.tgz that was attached to the v0.5.0 release of D-Scanner has some issues. I had to manually chmod +x it,

That's weird. I didn't had to do this (and can't reproduce this).

So it seems that we need to statically link Phobos when making the release executables.

This was my mistake. I build the v0.5.0 binary on my machine as there were still some problems with Travis. As it turns out that ArchLinux recently switched to pass -link-defaultlib-shared by default. The "official" LDC release binaries (i.e. the one used on Travis), don't have this problem and use static linking by default.
I just uploaded a fixed release archive.
LDC only has a -static flag which will result in linking in all system dependencies, but I'm not whether we want to do this either.
So I'm not sure what I can do about this in this PR.

Here's how the tarball would look like if built with the "official" LDC 1.8:

dfmt-v0.5.2-linux-x86_64.tar.gz

ldd ./dfmt
	linux-vdso.so.1 (0x00007fff02fe0000)
	librt.so.1 => /usr/lib/librt.so.1 (0x00007fe8629e2000)
	libdl.so.2 => /usr/lib/libdl.so.2 (0x00007fe8627de000)
	libpthread.so.0 => /usr/lib/libpthread.so.0 (0x00007fe8625c0000)
	libm.so.6 => /usr/lib/libm.so.6 (0x00007fe862274000)
	libgcc_s.so.1 => /usr/lib/libgcc_s.so.1 (0x00007fe86205d000)
	libc.so.6 => /usr/lib/libc.so.6 (0x00007fe861ca6000)
	/lib64/ld-linux-x86-64.so.2 => /usr/lib64/ld-linux-x86-64.so.2 (0x00007fe862e42000)

[wilzbach]

(Added all changes that happened at the DScanner repo to this PR - including the build of the Windows binaries - directly on Travis)