libpod/define: Make TypeBind a platform-specific constant

This allows us to redefine to the equivalent nullfs on FreeBSD.

[NO NEW TESTS NEEDED]

Signed-off-by: Doug Rabson <dfr@rabson.org>

libpod/define/mount.go

@@ -1,8 +1,6 @@
 package define
 
 const (
-	// TypeBind is the type for mounting host dir
-	TypeBind = "bind"
 	// TypeVolume is the type for named volumes
 	TypeVolume = "volume"
 	// TypeTmpfs is the type for mounting tmpfs

libpod/define/mount_freebsd.go

@@ -0,0 +1,8 @@
+//go:build freebsd
+
+package define
+
+const (
+	// TypeBind is the type for mounting host dir
+	TypeBind = "nullfs"
+)

libpod/define/mount_linux.go

@@ -0,0 +1,8 @@
+//go:build linux
+
+package define
+
+const (
+	// TypeBind is the type for mounting host dir
+	TypeBind = "bind"
+)

libpod/define/mount_unsupported.go

@@ -0,0 +1,8 @@
+//go:build !linux && !freebsd
+
+package define
+
+const (
+	// TypeBind is the type for mounting host dir
+	TypeBind = "bind"
+)