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 SAFE_MEMSET_H
#define SAFE_MEMSET_H

/* memset() guaranteed not to get optimized away by compiler.
   Should be used instead of memset() when clearing any sensitive data. */
void safe_memset(void *data, int c, size_t size);

#endif