Also update BUILD.txt

crypto_sha512crypt.c is a clone of nss_sha512crypt.c with the exception that
all usage of NSS and related libraries has been switched to libcrypto.
I renamed nss_sha512crypt.h to sha512crypt.h since it is common to both
crypto_sha512crypt.c and nss_sha512crypt.c. Note that the random number
generator is not seeded manually and thus relies on seeding done
automatically by libcrypto. On some systems without /dev/urandom
seeding may not be performed.
See http://www.openssl.org/docs/crypto/RAND_add.html.
Signed-off-by: George McCollister <georgem@novatech-llc.com>

This is the preferred way of setting the version in a file, as
autotools will properly monitor this file for changes and rerun
autoconf/configure when necessary to update the version. This
means that we don't need to manually perform an autoreconf in
order to build a new RPM

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.

This requires increasing the required autoconf version to 2.59 for
use of $(abs_builddir).

Fix uninstallation of python files as well

Test loops and _i are only available since 0.9.5.