use mmap on all unix platforms
use mmap on all unix platforms

RMGiroux/bde-allocator-benchmarks,apaprocki/bde,bloomberg/bde-allocator-benchmarks,abeels/bde,jmptrader/bde,gbleaney/Allocator-Benchmarks,gbleaney/Allocator-Benchmarks,abeels/bde,dharesign/bde,bloomberg/bde-allocator-benchmarks,osubboo/bde,dbremner/bde,che2/bde,RMGiroux/bde-allocator-benchmarks,dbremner/bde,idispatch/bde,apaprocki/bde,idispatch/bde,bloomberg/bde-allocator-benchmarks,che2/bde,bowlofstew/bde,abeels/bde,saxena84/bde,osubboo/bde,jmptrader/bde,bloomberg/bde,apaprocki/bde,bloomberg/bde,saxena84/bde,bloomberg/bde,dharesign/bde,osubboo/bde,minhlongdo/bde,bloomberg/bde,apaprocki/bde,idispatch/bde,abeels/bde,bowlofstew/bde,frutiger/bde,abeels/bde,mversche/bde,abeels/bde,osubboo/bde,dharesign/bde,mversche/bde,frutiger/bde,frutiger/bde,RMGiroux/bde-allocator-benchmarks,apaprocki/bde,che2/bde,jmptrader/bde,mversche/bde,RMGiroux/bde-allocator-benchmarks,idispatch/bde,minhlongdo/bde,RMGiroux/bde-allocator-benchmarks,mversche/bde,bloomberg/bde-allocator-benchmarks,gbleaney/Allocator-Benchmarks,dbremner/bde,che2/bde,bowlofstew/bde,bowlofstew/bde,jmptrader/bde,dharesign/bde,gbleaney/Allocator-Benchmarks,minhlongdo/bde,frutiger/bde,bloomberg/bde,bloomberg/bde-allocator-benchmarks,saxena84/bde,saxena84/bde,minhlongdo/bde,dbremner/bde