[Bug bootstrap/25672] [4.8/4.9/5 Regression] cross build's libgcc picks up CFLAGS

[olegendo at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=25672

--- Comment #41 from Oleg Endo <olegendo at gcc dot gnu.org> ---
That's nice!  While you're at it, could you maybe also have a look at PR 53579?
 It sounds like a similar issue...