SplFile{Info,Object} stub fixes #2088

Job	Run time
Run cs-fixer and stubs structure tests	2m 50s
Run tests against php 5.6	11m 19s
Run tests against php 7.0	11m 25s
Run tests against php 7.1	12m 12s
Run tests against php 7.2	12m 59s
Run tests against php 7.3	13m 12s
Run tests against php 7.4	13m 59s
Run tests against php 8.0	15m 20s
Run tests against php 8.1	14m 32s
Run tests against php 8.2	14m 35s
Run tests against php 8.3	15m 13s
	2h 17m 36s

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