switch back from golang.org/x/sys/execabs to os/exec (go1.19)

This is effectively a revert of 2ac9968401, which
switched from os/exec to the golang.org/x/sys/execabs package to mitigate
security issues (mainly on Windows) with lookups resolving to binaries in the
current directory.

from the go1.19 release notes https://go.dev/doc/go1.19#os-exec-path

> ## PATH lookups
>
> Command and LookPath no longer allow results from a PATH search to be found
> relative to the current directory. This removes a common source of security
> problems but may also break existing programs that depend on using, say,
> exec.Command("prog") to run a binary named prog (or, on Windows, prog.exe) in
> the current directory. See the os/exec package documentation for information
> about how best to update such programs.
>
> On Windows, Command and LookPath now respect the NoDefaultCurrentDirectoryInExePath
> environment variable, making it possible to disable the default implicit search
> of “.” in PATH lookups on Windows systems.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

mount/mount_linux.go

@@ -20,6 +20,7 @@ import (
 	"errors"
 	"fmt"
 	"os"
+	"os/exec"
 	"path"
 	"path/filepath"
 	"runtime"
@@ -28,8 +29,6 @@ import (
 	"time"
 
 	"github.com/sirupsen/logrus"
-
-	exec "golang.org/x/sys/execabs"
 	"golang.org/x/sys/unix"
 )