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enc: Use proper format specifier for size_t

Newbyte requested to merge Newbyte/libcmatrix:fix-32-bit-build into main

%lu, meaning long unsigned int, works fine on 64-bit architectures as it happens to be the same size as unsigned size_t there (both are 8 bytes), but on for instance 32-bit systems, unsigned size_t is half the size, 4 bytes, and as such this format specifier is not correct. This matters because the type returned by cm_olm_get_message_index is unsigned size_t and not unsigned long int. Replace it with %zu (unsigned size_t) which should work on any architecture.


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