[Bug preprocessor/94657] [patch] libcpp uses 'AR = ar' tool even if --build/--host are passed explicitly.

[slyfox at inbox dot ru]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94657

--- Comment #2 from Sergei Trofimovich <slyfox at inbox dot ru> ---
Sent as https://gcc.gnu.org/pipermail/gcc-patches/2020-April/544379.html