Update random_compat to latest master (~1.1.5)

Changes:
 * Checks `disable_classes` for `COM()` before using to avoid PHP Warnings
 * Uses `stream_set_chunk_size()` to avoid reading 8KiB from `/dev/urandom` unintentionally.
See #34948

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git-svn-id: https://core.svn.wordpress.org/trunk@35886 1a063a9b-81f0-0310-95a4-ce76da25c4cd