Account for inaccurate offsets in getXrefData() #607

Job	Run time
Tests alternative autoloader (PHP 7.1)	18s
PHPUnit (PHP 7.2)	39s
Tests alternative autoloader (PHP 7.2)	7s
PHPUnit (PHP 7.3)	32s
Tests alternative autoloader (PHP 7.3)	7s
PHPUnit coverage (PHP 7.4)	1m 3s
PHPUnit (PHP 7.4)	42s
Tests alternative autoloader (PHP 7.4)	7s
PHPUnit Composer v2 (PHP 7.4)	29s
PHPUnit (PHP 8.0)	28s
Tests alternative autoloader (PHP 8.0)	8s
PHPUnit (PHP 8.1)	37s
PHPUnit (PHP 7.1)	39s
PHPUnit (PHP 8.2)	39s
Tests alternative autoloader (PHP 8.1)	15s
PHPUnit lowest deps (PHP 7.3)	36s
Tests alternative autoloader (PHP 8.2)	8s
PHPUnit (PHP 8.3)	36s
Tests alternative autoloader (PHP 8.3)	6s
Windows-Tests with PHP 7.1	1m 11s
Windows-Tests with PHP 7.2	53s
Windows-Tests with PHP 7.3	54s
Windows-Tests with PHP 7.4	1m 6s
Windows-Tests with PHP 8.0	48s
Windows-Tests with PHP 8.1	1m 4s
Windows-Tests with PHP 8.2	53s
Windows-Tests with PHP 8.3	49s
	15m 54s

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