fix(libraries): resolve tcpdf incompatibility with PHP 7.2 #3411 #3418
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Description
PR to fix #3411
How Has This Been Tested?
Tested by exporting PDF from https://github.com/WordImpress/Give-PDF-Receipts/issues/145 and https://github.com/WordImpress/Give-Gift-Aid Add-on
Also tested by exporting PDF in PHP version 5.3 and PHP version 7.2 in both the version the PDF export featured is working fine
Screenshort
Types of changes
Bug fix (non-breaking change which fixes an issue)
Checklist: