pkg/system: remove deprecated DefaultPathEnv()

This was deprecated in 9f3e5eead5accb9fb405398af700d97e830a3b5b, which
is part of the v24.0.0 release, so we can remove it from master.

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

pkg/system/path_deprecated.go

@@ -1,18 +0,0 @@
-package system
-
-const defaultUnixPathEnv = "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
-
-// DefaultPathEnv is unix style list of directories to search for
-// executables. Each directory is separated from the next by a colon
-// ':' character .
-// For Windows containers, an empty string is returned as the default
-// path will be set by the container, and Docker has no context of what the
-// default path should be.
-//
-// Deprecated: use oci.DefaultPathEnv
-func DefaultPathEnv(os string) string {
-	if os == "windows" {
-		return ""
-	}
-	return defaultUnixPathEnv
-}