Commits on Jul 20, 2022

1. units: fix build with enableCurrenciesUpdater=false; pythonPackages=n… …

   …ull;
   
   Units allows to build it without a python dependency by setting {
   enableCurrenciesUpdater=false; pythonPackages=null; }.  Unfortunately
   this feature is currently broken due to two problems:
   
   1. The `pythonEnv` string is part of the builder environment, so it is
      not evaluated lazily.  This means that `pythonPackages==null` will
      always cause eval to fail.
   
   2. `pythonEnv` is used unconditionally in an antiquotation in the
      `prePatch` phase; if it is null this will fail.
   
   Let's fix these so we can build a pythonless "units" package.
   
   This is helpful when cross-compiling, because right now a lot of
   python packages (especially python-cryptography) fail to
   cross-compile.

   Adam Joseph committed Jul 20, 2022
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