Hadrian: validate fails in bindisttest install on powerpc64le

Summary

./validate fails with

((echo "ghc-heap" | grep rts) && (cat '/home/opensuse/ghc/bindisttest/install   dir/lib/ghc-9.1.20210217/lib/package.conf.d/ghc-heap-9.1.conf.copy' | sed 's|haddock-.*||' > '/home/opensuse/ghc/bindisttest/install   dir/lib/ghc-9.1.20210217/lib/package.conf.d/ghc-heap-9.1.conf.copy.copy')) || (cat '/home/opensuse/ghc/bindisttest/install   dir/lib/ghc-9.1.20210217/lib/package.conf.d/ghc-heap-9.1.conf.copy' > '/home/opensuse/ghc/bindisttest/install   dir/lib/ghc-9.1.20210217/lib/package.conf.d/ghc-heap-9.1.conf.copy.copy')
# We finally replace the original file.
mv '/home/opensuse/ghc/bindisttest/install   dir/lib/ghc-9.1.20210217/lib/package.conf.d/ghc-heap-9.1.conf.copy.copy' '/home/opensuse/ghc/bindisttest/install   dir/lib/ghc-9.1.20210217/lib/package.conf.d/ghc-heap-9.1.conf'
'/home/opensuse/ghc/bindisttest/install   dir/bin/ghc-pkg' recache
<command line>: not built for interactive use

Environment

• GHC version used: 8.8.3 (for bootstrap) building HEAD at dbf8f6fe

Optional:

• Operating System: Linux
• System Architecture: powerpc64le