Fix iconv bug (empty body when mail encoded in quoted-printable)

[hamdouni]

Hi !

I had some issue with emails resulting in empty ticket. I narrowed the problem to this state :

• if the body containes any accentued character (é or à for example)
• if the email has this in his header : "Content-Transfer-Encoding: quoted-printable"

Here are 2 samples of complete email.
The first one "mail.good" works nicely.
The second "mail.bad" gives an empty ticket.

mail.good:

Date: Thu, 7 Feb 2013 11:01:04 -0600
Delivered-To: support@osticket.com
Subject: Testing
From: Peter Rotich <peter@osticket.com>
To: support@osticket.com
Content-Type: text/plain; charset=ISO-8859-1

Testing testing.

mail.bad:

Date: Thu, 7 Feb 2013 11:01:04 -0600
Delivered-To: support@osticket.com
Subject: Testing
From: Peter Rotich <peter@osticket.com>
To: support@osticket.com
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

Testing testing =E9 

The difference is "Content-Transfer-Encoding: quoted-printable" in the header and =E9 (encoded é) inside the email body.

To test them inside a container, I use the internal mail piping as :

php -q /data/upload/api/pipe.php < mail.good

To fix that, I used this fix and it's now OK for the 2 samples.

Hope it helps.

[Netzvamp]

Hey, i've implemented your fix in my repo/pull request (https://github.com/Netzvamp/docker-osticket) . I had to change the URL to the CDN (as in docker-library/php#240 (comment) ) and put it in one line with the other RUNs for less layers. My tests where fine, so thanks 👍