Alire v1.21

Build switches, which worked for local crates, works now too for releases from an index (#1072).
Add support for FreeBSD (#1148)

Details:

Contributors: Fabien-Chouteau, Alejandro R. Mosteo , Anthony Ianozi, Stéphane Carrez

UID: 16687659996377592f0a0916377592f0a098

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