bug#36882: Qemu 4.2.0 build for x86_64-linux fails

[Mathieu Othacehe]

Hey,

> clang-runtime requires a similar fix for CPLUS_INCLUDE_PATH.  No idea
> what's up with GHC@8.4 yet, but unsurprisingly removing libc from the
> include paths does not make a difference.

Closing this one, thanks for pushing!

Mathieu