Fedora 35 support was dropped, so we can update to a newer Go.
Stable RHEL 8 and 9 and Fedora 36 ships Go 1.18, so let's switch to it.
"//go:build" directives are now apparently enforced by go fmt, so that's why
there were added.
Also, all the github actions were adjusted to use Go 1.18.
Signed-off-by: Ondřej Budai <ondrej@budai.cz>
Currently one would have to pass a `macos` flag explicitly to build on
OSX, but if we replace `macos` with `darwin` this happens automatically.
Signed-off-by: Tom Gundersen <teg@jklm.no>
The new crypt tests cannot be run on macOS. Making them conditional for
non-macOS platforms fixes running unit tests in the internal directory
on macOS.
