Function m4ri_sys::djb_push_back

pub unsafe extern "C" fn djb_push_back(
    z: *mut Djb, 
    target: Rci, 
    source: Rci, 
    srctyp: Srctyp
)

Add a new operation out[target] ^= srctype[source] to queue

z: DJB linear map target: output index source: input index srctyp: Type of input (source_source or source_target)