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Sergei Trofimovich authored Jun 25, 2022 and Marge Bot committed Jun 28, 2022

before the change `make install` was failing as:

```
"mv" "/<<NIX>>/ghc-9.3.20220406/lib/ghc-9.5.20220625/bin/ghc-stage2" "/<<NIX>>/ghc-9.3.20220406/lib/ghc-9.5.20220625/bin/ghc"
make[1]: *** No rule to make target 'mk/system-cxx-std-lib-1.0.conf.install', needed by 'install_packages'.  Stop.
```

I think it's a recent regression caused by 0ef249aa where `system-cxx-std-lib-1.0.conf`
is created (somewhat manually), but not the .install varianlt of it.

The fix is to consistently use `mk/system-cxx-std-lib-1.0.conf` everywhere.

Closes: #21784