[Bug other/82997] [8 regression] gcc.dg/cpp/sysmac1.c and gcc.dg/cpp/macsyntx.c fail starting with r254707

[joseph at codesourcery dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82997

--- Comment #5 from joseph at codesourcery dot com <joseph at codesourcery dot 
com> ---
Jakub's patch is 
<https://gcc.gnu.org/ml/gcc-patches/2017-11/msg01041.html>.