http2: Remove unused Curl_http2_strerror function declaration by Biswa96 · Pull Request #10912 · curl/curl

Curl_http2_strerror was renamed to http2_strerror in 05b100aee247bb9bec8e9a1b0166496aa4248d1c and then http2_strerror was removed in 5808a0d0f5ea0399d4a2a22285f78c66f302c173 This also fixes the fo...