Fix #70315: imagecreatefromstring() returns Server Error but page is … #1990
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…rendered
That happens because the external libgd uses other error codes than PHP
(and the bundled libgd), but the libgd error codes are simply forwarded
to php_verror(). We fix that by properly mapping libgd errors to PHP errors.
As already mentioned in the bug report, this doesn't necessarily mean that external and bundled libgd behave identically now, but at least we avoid inconsistencies like the one reported. Fixing the bundled libgd to match external libgd is probably best done for PHP 7.1.0 only.
Another issue is that most likely some PHPTs will fail after this change (when run again an external libgd PHP build), but there are already plenty of failing tests in this case now (I got 43 with and without the patch).