arena: Fixed mmap limits for 32-bit architectures
arena: Fixed mmap limits for 32-bit architectures

Fixes Snaipe/Criterion#176.

diacritic/BoxFort,Snaipe/BoxFort,diacritic/BoxFort,Snaipe/BoxFort,Snaipe/BoxFort,Snaipe/BoxFort,diacritic/BoxFort,diacritic/BoxFort