Allow building without gfortran if we're just using everything from BB #39338
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On systems where we don't have
gfortran
installed, there's no reasonto require it, because nowadays we get everything from Yggdrasil anyway.
Simply soldier on and assume that the user wants the latest support
libraries, unless they are trying to build from source.
This is particularly useful on Apple M1 machines, where a native build of
gfortran
is a bother to install.