Fix broken build and address cross compilation

[tarakby]

Problem

Current release build on master is broken after importing the latest version of the crypto package. The new crypto package version requires CGO to be enabled and requires specifying the correct C compiler for cross-compilation (the new crypto version uses portable and non-portable code). The current CI build cross compiles on the same machine for multiple targets.
For now, a workaround is to use the old crypto version (which uses go build tags to not include the non-portable code part). This issue aims to solve the cross-compilation properly with a proper solution.

cc @sideninja

[chasefleming]

This has been fixed by: #1423