Without this, and with `-Denable-qemu -Denable-foreign-glibc`,
i386-linux-gnu tests failed because the `-L` path passed to qemu
was "i386-linux-gnu" (nonexistent) rather than "i686-linux-gnu".
Fixes std lib and behavior tests when using these options to enable
test coverage with cross compiled glibcs.
799d1f0d36