acme/autocert: change a var to a const
A var isn't needed and a const is what the upstream (Go 1.10+) version
it's copying is.
@@ -276,7 +276,7 @@ func supportsECDSA(hello *tls.ClientHelloInfo) bool {
ecdsaOK := false
schemeLoop:
for _, scheme := range hello.SignatureSchemes {
- var tlsECDSAWithSHA1 tls.SignatureScheme = 0x0203 // constant added in Go 1.10
+ const tlsECDSAWithSHA1 tls.SignatureScheme = 0x0203 // constant added in Go 1.10
switch scheme {
case tlsECDSAWithSHA1, tls.ECDSAWithP256AndSHA256,
tls.ECDSAWithP384AndSHA384, tls.ECDSAWithP521AndSHA512:
