Clarify comment on CFLAGS contents in "warn" description.

Reviewed-by: Stephen Gallagher <sgallagh@redhat.com>
Reviewed-by: Michal Žídek <mzidek@redhat.com>

Explicitly substitute empty strings for unbound variables in bashrc_sssd
to support its use in scripts with unbound variable detection enabled
(set -u).

Reviewed-by: Stephen Gallagher <sgallagh@redhat.com>
Reviewed-by: Michal Žídek <mzidek@redhat.com>

Use functions instead of aliases as commands in bashrc_sssd.
This allows easier use of bashrc_sssd in scripts, since aliases are
disabled by default for non-interactive Bash shells.

Reviewed-by: Stephen Gallagher <sgallagh@redhat.com>
Reviewed-by: Michal Žídek <mzidek@redhat.com>

Use "machine hardware name" instead of "processor name" as the build
architecture in bashrc_sssd.

This fixes determining architecture on systems where "processor name" is
not available and is reported by uname(1) as "unknown", e.g. Debian.

Reviewed-by: Stephen Gallagher <sgallagh@redhat.com>
Reviewed-by: Michal Žídek <mzidek@redhat.com>

The journal provided by systemd gives us structured logging
capabilities that we should be taking advantage of.

Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>
Reviewed-by: Lukáš Slebodník <lslebodn@redhat.com>

 * Stop using --target (unneeded)
 * Drop explicit use of --with-default-ccache* since we now pick it up
   from libkrb5

There was an inconsistency with how the warnings were specified and
how they were consumed by the macros. The result was that warnings were
hidden.

Recommended way to create SRPM is to run make (prerelease-)srpm.
But in previous case make file have to be generated, therefore
configure script should not fail. (all sssd required dependencies have to be
installed)
Script make_srpm.sh can be runned without running configure, script can be
runned only from git repository.

https://fedorahosted.org/sssd/ticket/1927