Account for inaccurate offsets in getXrefData() (#692) #611

Job	Run time
PHPUnit Composer v2 (PHP 7.4)	41s
PHPUnit (PHP 7.2)	29s
PHPUnit (PHP 7.3)	32s
Tests alternative autoloader (PHP 7.1)	13s
PHPUnit coverage (PHP 7.4)	1m 33s
PHPUnit (PHP 7.4)	47s
PHPUnit (PHP 7.1)	39s
Tests alternative autoloader (PHP 7.2)	12s
PHPUnit (PHP 8.0)	38s
PHPUnit (PHP 8.1)	40s
Tests alternative autoloader (PHP 7.3)	6s
PHPUnit (PHP 8.2)	30s
PHPUnit lowest deps (PHP 7.3)	43s
PHPUnit (PHP 8.3)	27s
Tests alternative autoloader (PHP 7.4)	5s
Tests alternative autoloader (PHP 8.0)	7s
Tests alternative autoloader (PHP 8.1)	6s
Windows-Tests with PHP 7.1	1m 10s
Tests alternative autoloader (PHP 8.2)	6s
Windows-Tests with PHP 7.2	52s
Tests alternative autoloader (PHP 8.3)	10s
Windows-Tests with PHP 7.3	49s
Windows-Tests with PHP 7.4	45s
Windows-Tests with PHP 8.0	51s
Windows-Tests with PHP 8.1	54s
Windows-Tests with PHP 8.2	52s
Windows-Tests with PHP 8.3	48s
	15m 45s

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