pacstrap: Fix creation of default directories

$newroot might be a relative path, so remove the leading slash.

Signed-off-by: Pierre Schmitz <pierre@archlinux.de>

pacstrap.in

@@ -63,7 +63,7 @@ fi
 
 # create obligatory directories
 msg 'Creating install root at %s' "$newroot"
-mkdir -p "$newroot/var/lib/pacman" "/$newroot"/{dev,proc,sys,run,tmp,etc}
+mkdir -p "$newroot/var/lib/pacman" "$newroot"/{dev,proc,sys,run,tmp,etc}
 
 # always call umount on quit after this point
 trap 'api_fs_umount "$newroot" 2>/dev/null' EXIT