vendor latest c/common from main

Signed-off-by: Paul Holzinger <pholzing@redhat.com>

vendor/github.com/smallstep/pkcs7/internal/legacy/x509/debug.go

@@ -0,0 +1,14 @@
+package legacyx509
+
+import "fmt"
+
+// legacyGodebugSetting is a type mimicking Go's internal godebug package
+// settings, which are used to enable / disable certain functionalities at
+// build time.
+type legacyGodebugSetting int
+
+func (s legacyGodebugSetting) Value() string {
+	return fmt.Sprintf("%d", s)
+}
+
+func (s legacyGodebugSetting) IncNonDefault() {}