limit uc_mem_(read|write) size to INT_MAX

[JonathonReinhart]

Fixes #132.

[aquynh]

if we limit the read/write size to INT_MAX, should we also limit the memory size of uc_mem_map() & uc_mem_unmap() to the same number?

[JonathonReinhart]

This was added simply because cpu_physical_memory_rw takes an int. I would have to review the underlying code used to implement uc_mem_map. But nothing is stopping one from calling read multiple times to overcome the 4GB limitation, if they have more memory mapped.

[wtdcode]

Link to #1217 for further investigation.

[wtdcode]

Fixed in df5daed. Thanks!