unbreak compilation on GNU/Linux i386
unbreak compilation on GNU/Linux i386

Recent commit to fix int overflow for implausibly huge allocation
added call to std::min. Notably, first arg was old size divided by
unsigned long 4. And on GNU/Linux i386 size_t is not long. So such
division was promoting first arg to unsigned long while second arg was
still size_t, so just unsigned. And that caused compilation to fail.

Fix is droping 'ul'.

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