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Prevent integer overflow when allocating arrays

Merged Tony Finch requested to merge fanf-overflow-checks into main

Ensure that the size calculation does not overflow when allocating memory for an array.

Add ISC_OVERFLOW macros for checked arithmetic operations. Use them to implement isc_mem_callocate(). Use isc_mem_callocate() where appropriate.

Closes: #4120 (closed) #4121 (closed) #4122 (closed)

Edited by Ondřej Surý