bug#28231: log-file: echo name at the end of builds

[ng0 <ng0@infotropique.org>]

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When a build invoked with --no-build-hook -K --log-file fails, this is the
last output you'll see:

14:01.58 565 compiler warnings present.
mach configuremachphase `configure' failed after 869.5 seconds
note: keeping build directory `/tmp/guix-build-thunderbird-52.2.1.drv-0'
builder for `/gnu/store/n7qma1ypp2px1shd88r736ykjg5dngll-thunderbird-52.2.1.drv' failed with exit code 1
@ build-failed /gnu/store/n7qma1ypp2px1shd88r736ykjg5dngll-thunderbird-52.2.1.drv - 1 builder for `/gnu/store/n7qma1ypp2px1shd88r736ykjg5dngll-thunderbird-52.2.1.drv' failed with exit code 1
guix build: error: build failed: build of `/gnu/store/n7qma1ypp2px1shd88r736ykjg5dngll-thunderbird-52.2.1.drv' failed

As far as I remember from builds I have aborted at the beginning, the
logfile name is displayed when the build process beginns.

In my opinion we should also display them at the end builds (however they end).
If we don't record logs of failed builds, we should start doing that.
-- 
ng0
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