[Bug 223170] devel/libevent: Respect $OPENSSLLIB

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=223170

            Bug ID: 223170
           Summary: devel/libevent: Respect $OPENSSLLIB
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: mm at FreeBSD.org
          Reporter: thierry at FreeBSD.org
             Flags: maintainer-feedback?(mm at FreeBSD.org)
          Assignee: mm at FreeBSD.org

Created attachment 187371
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=187371&action=edit
Using pkg-config to detect openssl.pc

When built in a clean environment (e.g. poudriere, like on the packages
cluster), libevent is linked against libcrypto provided by the base system:

ldd /usr/local/lib/libevent-2.1.so.6
/usr/local/lib/libevent-2.1.so.6:
        libcrypto.so.8 => /lib/libcrypto.so.8 (0x801400000)
        libthr.so.3 => /lib/libthr.so.3 (0x801869000)
        libc.so.7 => /lib/libc.so.7 (0x800825000)

When you link it from another port, you get this warning:

/usr/bin/ld: warning: libcrypto.so.8, needed by
/usr/local/lib/libevent-2.1.so.6, may conflict with libcrypto.so.9

and actually this might cause hard to debug problems.

Just adding pkg-config to detect openssl.pc solves the problem.
(Warning: the problem exists if the package has been built in poudriere, but
when built from a port on a machine where pkg-config is installed, configure is
smart enough to detect it)

After this fix:
ldd /usr/local/lib/libevent_openssl-2.1.so.6
/usr/local/lib/libevent_openssl-2.1.so.6:
        libssl.so.9 => /usr/local/lib/libssl.so.9 (0x801206000)
        libcrypto.so.9 => /usr/local/lib/libcrypto.so.9 (0x801600000)
        libthr.so.3 => /lib/libthr.so.3 (0x801a75000)
        libc.so.7 => /lib/libc.so.7 (0x800825000)

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