Description of problem:
moodle-2.9-unbundle-tcpdf.patch produces an error at the lib/pdflib.php file, line 149. After applying the patch, the line says:

require_once('/tcpdf/tcpdf.php');

But Moodle can't find the referred file from the php-tcpdf package. The code works if the first slash is removed:

require_once('tcpdf/tcpdf.php');

Version-Release number of selected component (if applicable):
3.1.7-1.el7.noarch

How reproducible:
Always

Steps to Reproduce:
1. Install a 
2. Create a new course
3. Add a new assignment

Actual results:
Moodle fails with a 500 error, and if you activate debugging (Site administration > Development > Debugging > Display debug message) you could see the following messages

Warning: require_once(/tcpdf/tcpdf.php): failed to open stream: No such file or directory in /var/www/moodle/web/lib/pdflib.php on line 149

Fatal error: require_once(): Failed opening required '/tcpdf/tcpdf.php' (include_path='/var/www/moodle/web/lib/pear:.:/usr/share/pear:/usr/share/php') in /var/www/moodle/web/lib/pdflib.php on line 149

Expected results:
* Users should be able to add assignments to a course

Additional info: