[PATCH] services: process_send_command: Initialize OVERLAPPED Offset

[Jefferson Carpenter]

Supersedes patch #180602

Added #define NONAMELESSSTRUCT to rpc.c so that it compiles regardless 
of nameless struct compiler support.

This seems like a good way to solve that problem in general, but I also 
really like the code in wordpad.c that goes

#ifdef NONAMELESSUNION
# define U(x)  (x).u
# define U2(x) (x).u2
# define U3(x) (x).u3
#else
# define U(x)  (x)
# define U2(x) (x)
# define U3(x) (x)
#endif

for its brevity and generality.

thanks,
Jefferson