Fix VPATH build of RQUOTA support. Some rpcgen derive #include "..." paths from the infile argument. This will be off for VPATH builds, as the generated rquota_xdr.c code will look in $(srcdir), but we'll generate the rquota.h file in $(builddir). Play safe and copy rquota.x to $(builddir) first. This fixes the build on openSUSE 11.1.

#ifndef ISTREAM_CONCAT_H
#define ISTREAM_CONCAT_H

/* Concatenate input streams into a single stream. */
struct istream *i_stream_create_concat(struct istream *input[]);

#endif