#534 Use of @bindtextdomain returns null if gettext missing

Tracked down why 'blank pages' were being returned
after upgrading to 1.3. Running php-4.4.2. In
IniConfig.php, on line 712, use of bindtextdomain call
results in a the processor ceasing to run.
Semi-documented in
http://us2.php.net/manual/en/function.bindtextdomain.php
footnotes.

Results in blank page returns, no error codes or
anything. Very confusing.

Suggest checking for gettext extention in this function
instead of relying on it blindly. Not compiled in by
default to php custom compiles.

We're running Apache/2.2.2 (Unix) mod_ssl/2.2.2
OpenSSL/0.9.7e PHP/4.4.2 mod_perl/2.0.2 Perl/v5.8.3
with phpwiki-1.3.12p2.