[2.7] bpo-30622: Change NPN detection: (GH-2079)

[Sp1l]

Fix build with OpenSSL 1.1 without NPN
Small omission in original backport/cherry-pick

https://bugs.python.org/issue30622

[the-knights-who-say-ni]

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[ned-deily]

@tiran Is this open PR still needed?

[tiran]

No, the PR is no longer needed. The problem has been fixed in df1732a .