[Replicant] 'sign-build': Make certificate creation more robust

[doak]

Dear Replicant developers,

in reference to issue [#1870] I made the creation of certificates ('./vendor/replicant/sign-build') more robust.
Please find the patches attached. Let me know if they need some rework to be accepted. Feel free to accept only some of them as well.

[#1870] https://redmine.replicant.us/issues/1870


Best regards,
doak



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