[Bug 268258] security/p5-Crypt-SSLeay: fix build with clang 15

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=268258

            Bug ID: 268258
           Summary: security/p5-Crypt-SSLeay: fix build with clang 15
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: perl@FreeBSD.org
          Reporter: dim@FreeBSD.org
             Flags: maintainer-feedback?(perl@FreeBSD.org)
          Assignee: perl@FreeBSD.org

During an exp-run for llvm 15 (see bug 265425), it turned out that
security/p5-Crypt-SSLeay failed to build with clang 15:

  SSLeay.xs:159:31: warning: call to undeclared function 'SSLv2_client_method';
ISO C99 and later do not support implicit function declarations
[-Wimplicit-function-declaration]
              ctx = SSL_CTX_new(SSLv2_client_method());
                                ^
  SSLeay.xs:159:31: error: incompatible integer to pointer conversion passing
'int' to parameter of type 'const SSL_METHOD *' (aka 'const struct
ssl_method_st *') [-Wint-conversion]
              ctx = SSL_CTX_new(SSLv2_client_method());
                                ^~~~~~~~~~~~~~~~~~~~~

This is because SSLeay.xs uses the obsolete define OPENSSL_NO_SSL2 to determine
whether OpenSSL still supports SSLv2. Since this define was removed from
OpenSSL 1.1 and later, define it via CFLAGS instead.

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