[PATCH] desc-cpu.scm: support passing the instruction endianness to cgen_cpu_open

[Jose E. Marchesi]

            > The accompanying patch for opcodes will be sent to
            > binutils@sourceware.org today.  This CGEN patch will have to be applied
            > first though.
            > 
            > OK for master?
            
            Sure, and it seems to have been anticipated.
            
        Thanks.  I will push once the binutils stuff is also ready... found a
        complication.
    
    Ok I think I got the binutils side nailed.  Will post the patches to
    binutils@sourceware once regression testing finishes running, later
    today.
    
    After the binutils part is approved I will push the following (fixed)
    version of the CGEN patch, to master:

Patch pushed to master.
Salud!