[Bug sanitizer/64839] libsanitizer shouldn't require <rpc/xdr.h>

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64839

--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
if test "$ac_cv_header_rpc_xdr_h" = "yes"; then
etc. should be written as
if test x"$ac_cv_header_rpc_xdr_h" = xyes; then
Otherwise, LGTM (patch preapproved), but if you want to get it into GCC 5,
commit it RSN (within a few hours).