bug#20824: configure --disable-daemon no longer works

[Mark H Weaver]

It appears that --disable-daemon has become broken in our build system.
I have periodically built guix from git on hydra with --disable-daemon,
but this now leads to the following error in fef3cfa:

--8<---------------cut here---------------start------------->8---
  CXXLD    guix-daemon
g++: no input files
make[2]: *** [guix-daemon] Error 1
--8<---------------cut here---------------end--------------->8---

I've attached a full transcript of the failure.

      Mark

guix-build-failure-2015-06-16.gz
Description: Transcript of failed build attempt