[stable19] Fix file size computation on 32bit platforms

[backportbot-nextcloud]

backport of #23257

[faily-bot]

🤖 beep boop beep 🤖

Here are the logs for the failed build:

Status of 67: failure

mysql5.6-php7.2

Show full log

There were 3 warnings:

1) Test\Files\ViewTest::testRenameFailDeleteTargetKeepSource
Trying to configure method "writeStream" which cannot be configured because it does not exist, has not been specified, is final, or is static

2) Test\Files\ViewTest::testCopyFailDeleteTargetKeepSource
Trying to configure method "writeStream" which cannot be configured because it does not exist, has not been specified, is final, or is static

3) OCA\Files_Sharing\Tests\External\ManagerTest::testAddShare
Cannot stub or mock class or interface "OCA\Files_Sharing\Tests\External\IManager" which does not exist

--

There was 1 failure:

1) Test\Files\Cache\Wrapper\CachePermissionsMaskTest::testSearchMasked with data set #3 (1)
Failed asserting that actual size 0 matches expected size 2.

/drone/src/tests/lib/Files/Cache/Wrapper/CachePermissionsMaskTest.php:95