[openssl/openssl] 0a3f1a: fix demos/sslecho/main.c so it builds on OpenBSD too

[Sashan]

  Branch: refs/heads/openssl-3.1
  Home:   https://github.com/openssl/openssl
  Commit: 0a3f1a2ba890271d94f550a893bb136beeb38b72
      https://github.com/openssl/openssl/commit/0a3f1a2ba890271d94f550a893bb136beeb38b72
  Author: sashan <anedvedicky at gmail.com>
  Date:   2024-03-25 (Mon, 25 Mar 2024)

  Changed paths:
    M demos/sslecho/main.c

  Log Message:
  -----------
  fix demos/sslecho/main.c so it builds on OpenBSD too

trying to build `demos/sslecho/main.c` shipped by current openssl
fails with error as follows:
```
cc -I../../include -g -Wall   -c -o main.o main.c
main.c:35:24: error: variable has incomplete type 'struct sockaddr_in'
    struct sockaddr_in addr;
                       ^
main.c:35:12: note: forward declaration of 'struct sockaddr_in'
    struct sockaddr_in addr;
           ^
main.c:46:32: error: use of undeclared identifier 'INADDR_ANY'
        addr.sin_addr.s_addr = INADDR_ANY;
                               ^
main.c:152:24: error: variable has incomplete type 'struct sockaddr_in'
    struct sockaddr_in addr;
                       ^
main.c:152:12: note: forward declaration of 'struct sockaddr_in'
    struct sockaddr_in addr;
           ^
3 errors generated.
gmake: *** [<builtin>: main.o] Error 1
```

including `netinet/in.h` fixes the build

Reviewed-by: Matt Caswell <matt at openssl.org>
Reviewed-by: Tomas Mraz <tomas at openssl.org>
(Merged from https://github.com/openssl/openssl/pull/23936)

(cherry picked from commit 01eaf203856bfbb63051f8ecf56eae2d21132496)



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