Fix OOB read due to timezone_open() with 5 digit offset

This has been reported as bug #78984, and is generally and properly
fixed as of timelib 2020.3 (PHP-8.0). However, it is not fixe

Fix OOB read due to timezone_open() with 5 digit offset

This has been reported as bug #78984, and is generally and properly
fixed as of timelib 2020.3 (PHP-8.0). However, it is not fixed in
PHP-7.4, where the test results in an OOB read, and an unterminated
C string when calling `::getName()`. Therefore, we apply a minimal
fix which just avoids this dangerous behavior.

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