This changes our approach from having independent tarballs to
having a single, monolithic tarball for all of the libraries

Old versions of autoconf (before 2.60) did not include
support for the docdir and abs_builddir variables. This
patch emulates support for them.

Fixes https://fedorahosted.org/sssd/ticket/422

Right now, the pkg-config checks for the system version of
libdhash are forcibly disabled, requiring the SSSD to build it
from its own tree. In the future, when we split the libraries off
from the SSSD, it will be easy to switch this check to the
external library.

Previously, only the SSSD server components were being built with
compile-time warnings enabled. This patch will ensure that all
components in common and sss_client are also built the same way.

If automake 1.11 or higher is available, use of the configure
option '--enable-silent-rules' will suppress most build messages
and replace them with lines such as
CC   sysdb.o

This affects libtool as well.

Ensures that the common libraries build statically.
Also ensures that the sssd.spec creates the SYSV init script with
the appropriate permissions.

Cleans up the useless rpmdist target that was obsolete.

Adds the *.so.N.0.0 files to the RPM, as the .so and .so.N files
were dangling symlinks.

Allow configuration and build of individual SSSD utility libraries
from their own subdirectories. Building all utilities is still
possible recursively from the common root.