feat(aa): add define parameter for variables.

pkg/aa/apparmor_test.go

@@ -47,7 +47,7 @@ func TestAppArmorProfile_String(t *testing.T) {
 					Includes: []*Include{{IsMagic: true, Path: "tunables/global"}},
 					Aliases:  []*Alias{{Path: "/mnt/usr", RewrittenPath: "/usr"}},
 					Variables: []*Variable{{
-						Name:   "exec_path",
+						Name: "exec_path", Define: true,
 						Values: []string{"@{bin}/foo", "@{lib}/foo"},
 					}},
 				},

pkg/aa/preamble.go

@@ -73,6 +73,9 @@ type Variable struct {
 	RuleBase
 	Name   string
 	Values []string
+	Define bool
+}
+
 }
 
 func (r *Variable) Less(other any) bool {