Arch Linux

Description:
My arch boot failed after recent upgraded, the console show the following message:
```
mount: /new_root: can't find UUID=faa2047d...
You are now being dropped into an emergency shell.
...
[rootfs ]#
```

I tested that upgrade to version 35.1-1 but revert the change of script `init`, boot succeeded.
It seems that step `resolve_device` cannot be skipped for "slow" devices like root on USB.
```
diff --git a/mkinitcpio-35/init b/build/init
old mode 100644
new mode 100755
index a2226db..f371ee6
--- a/mkinitcpio-35/init
+++ b/build/init
@@ -51,15 +51,8 @@ if [ "${break}" = "y" ] || [ "${break}" = "premount" ]; then
launch_interactive_shell
fi

-# If the tag is supported by util-linux mount, pass it as is.
-# Otherwise, use the resolved device path.
-case "$root" in
- 'UUID='* | 'LABEL='* | 'PARTUUID='* | 'PARTLABEL='*) : ;;
- *)
- rootdev="$(resolve_device "$root")" && root="$rootdev"
- unset rootdev
- ;;
-esac
+rootdev=$(resolve_device "$root") && root=$rootdev
+unset rootdev

fsck_root

```

Additional info:
* version 34-2 works, version 35.1-1 or newer doesn't

Steps to reproduce:
0. Install arch, make sure root is on USB device, and the mkinitcpio version is 34-2
1. Upgrade mkinitcpio to 35.1-1 or newer
2. Reboot