bug#20272: Support reproducible builds

[Bernhard M. Wiedemann]

Parallel builds with guile-3.0.9 still introduce non-determinism

I tested with openSUSE's guile-newt package
and found (with filterdiff[1])
filterdiff strings */site-ccache/newt/checkboxtree.go
produced among others

 newtCheckboxTree
-/usr/lib64/libnewt
+config
+%libnewt
 dynamic-link
 dynamic-func

[...]

 newt/bindings.scm
 newt/checkboxtree.scm
-newt/config.scm
 ice-9/boot-9.scm
 make-checkboxtree


so it is not just a simple ordering issue, but certain entries are 
missing or replaced.
Is there an equivalent of objdump for .go files to see what is in there?


[1]https://github.com/bmwiedemann/reproducibleopensuse/blob/master/filterdiff

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