Updated LDC snap package with improved Ubuntu 14.04 support

[Joseph Rushton Wakeling via Digitalmars-d-announce]

Revision 4 of the ldc2 snap package is now available in the 
'edge' channel of the snap store.  This still provides LDC 1.1.0 
with an LLVM 3.9.1 backend, but has been rebuilt in a clean build 
using the latest `snapcraft` release, which has improved support 
for classic snaps across different distributions.

This package should therefore now work on Ubuntu 14.04 LTS as 
well as on 16.04 or later.

Link-time optimization (the `-flto={full,thin}` flag) is however 
still limited to Ubuntu 16.04 or later: on 14.04 it will fail 
with a linker error.

As always, I'd be very happy if people could try this out and let 
me know how it works for you.


-- to install --

This package should be possible to install on Ubuntu 16.04 or 
later, or Ubuntu 14.04, as well as any other distro making 
available a recent version of snapd (2.21 or later):
https://snapcraft.io/docs/core/install

Once snapd is installed (on Ubuntu or Debian, `sudo apt install 
snapd`), the ldc2 snap can be installed with:

     sudo snap install --classic --edge ldc2

If you already have a version installed, you can upgrade it with:

     sudo snap refresh --classic --edge ldc2

Note, if this version breaks something for you, you can downgrade 
to revision 3 with:

     sudo snap refresh --classic --edge --revision=3 ldc2