Zsolt Parragi authored Nov 06, 2018 and Brad King committed Feb 08, 2019

Exit code constants on Windows, such as `STATUS_NO_MEMORY` do not fit in
a 32-bit signed integer type.  They do fit in an unsigned 32-bit type,
but for compatibility with UNIX semantics we treat exit codes as signed.
Use a 64-bit signed integer to handle both.