Win32: i386 now assumed when crossbuilding (ticket #2416). Previously, NGX_MACHINE was not set when crossbuilding, resulting in NGX_ALIGNMENT=16 being used in 32-bit builds (if not explicitly set to a correct value). This in turn might result in memory corruption in ngx_palloc() (as there are no usable aligned allocator on Windows, and normal malloc() is used instead, which provides 8 byte alignment on 32-bit platforms). To fix this, now i386 machine is set when crossbuilding, so nginx won't assume strict alignment requirements.