The $Id$ keywords were used in Subversion where they can be substituted
with filename, last revision number change, last changed date, and last
user who changed it.

In Git this functionality is different and can be done with Git attribute
ident. These need to be defined manually for each file in the
.gitattributes file and are afterwards replaced with 40-character
hexadecimal blob object name which is based only on the particular file
contents.

This patch simplifies handling of $Id$ keywords by removing them since
they are not used anymore.

We always provide a crypt implementation. HAVE_CRYPT is only
relevant as to whether the crypt() C function exists.

* PHP-5.6:
  Happy new year (Update copyright to 2016)

The deprecation of DES salts created a warning when trying to verify them with password_hash. This bug fix adds a quiet mode to php_crypt() which is used by password_verify.