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 HOSTPID_H
#define HOSTPID_H

extern const char *my_hostname;
extern const char *my_pid;

/* Initializes my_hostname and my_pid. */
void hostpid_init(void);

/* Returns the current host+domain, or if it fails fallback to returning
   hostname. */
const char *my_hostdomain(void);

#endif