gdb.info: Integral datatypes

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Integral datatypes

The integral datatypes used in the system calls are
     int, unsigned int, long, unsigned long, mode_t and time_t
   `Int', `unsigned int', `mode_t' and `time_t' are implemented as 32
bit values in this protocol.
   `Long' and `unsigned long' are implemented as 64 bit types.
   *Note Limits::, for corresponding MIN and MAX values (similar to
those in `limits.h') to allow range checking on host and target.
   `time_t' datatypes are defined as seconds since the Epoch.
   All integral datatypes transferred as part of a memory read or write
of a structured datatype e.g. a `struct stat' have to be given in big
endian byte order.