Make get_dh1024 compatible with OpenSSL v1.1.0
#1178
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Fixes the following error:
```
../../../../ext/puma_http11/mini_ssl.c: In function ‘get_dh1024’:
../../../../ext/puma_http11/mini_ssl.c:90:5: error: dereferencing pointer to incomplete type ‘DH {aka struct dh_st}’
dh->p = BN_bin2bn(dh1024_p, sizeof(dh1024_p), NULL);
^~
```
These changes are based on the following patch to nginx:
<nginx/nginx@789abf2>
("SSL: default DH parameters compatible with OpenSSL 1.1.0").
Relevant parts of the nginx source code in their full context can be
found here:
<https://github.com/nginx/nginx/blob/release-1.10.2/src/event/ngx_event_openssl.c#L954-L980>.
For reference:
> *) Made DH and DH_METHOD opaque. The structures for managing DH objects
> have been moved out of the public header files. New functions for managing
> these have been added.
> [Matt Caswell]
<https://www.openssl.org/news/cl110.txt>
Fixes puma#1136.
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Fixes the following error:
These changes are based on the following patch to nginx:
nginx/nginx@789abf2
("SSL: default DH parameters compatible with OpenSSL 1.1.0").
Relevant parts of the nginx source code in their full context can be
found here:
https://github.com/nginx/nginx/blob/release-1.10.2/src/event/ngx_event_openssl.c#L954-L980.
For reference:
https://www.openssl.org/news/cl110.txt
Fixes #1136.