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.
Since PECL/sqlite3 has been moved to ext/sqlite3 in 2008, the SQLite3
module version is hardcoded to `0.7-dev`. It doesn't appear to make
much sense to have an own module version for a bundled extensions, but
as other code might rely on it, we don't remove the constant but rather
make it an alias of the PHP version.
