fails to build with LibreSSL 2.9.0

[metalefty]

Describe the bug
Fails to build with LibreSSL 2.9.0. Found while testing #5049 on FreeBSD. It builds fine with LibreSSL 2.8.3 but fails with 2.9.0 due to structual change.

FAILED: libfreerdp/CMakeFiles/freerdp.dir/crypto/tls.c.o
/usr/bin/cc -DCMAKE_BUILD_TYPE=Release -DEXT_PATH=\"/usr/local/lib/freerdp2/extensions\" -DFREERDP_EXPORTS -DHAVE_CONFIG_H -DWINPR_EXPORTS -DWITH_OPENSSL -DWITH_WAYLAND -DWITH_X11 -DWITH_XKBFILE -D_FILE_OFFSET_BITS=64 -Dfreerdp_EXPORTS -I.
-Iinclude -I/wrkdirs/usr/ports/net/freerdp/work/FreeRDP-2.0.0-rc4/include -I/wrkdirs/usr/ports/net/freerdp/work/FreeRDP-2.0.0-rc4/winpr/include -Iwinpr/include -I/usr/local/include -O2 -pipe  -fstack-protector -isystem /usr/local/include -fno-strict-aliasing -Wno-unused-parameter -Wno-unused-macros -Wno-padded -Wno-c11-extensions -Wno-gnu -Wno-unused-command-line-argument -Wno-deprecated-declarations -DWINPR_DLL -O2 -pipe  -fstack-protector -isystem /usr/local/include -fno-strict-aliasing -fPIC -MD -MT libfreerdp/CMakeFiles/freerdp.dir/crypto/tls.c.o -MF libfreerdp/CMakeFiles/freerdp.dir/crypto/tls.c.o.d -o libfreerdp/CMakeFiles/freerdp.dir/crypto/tls.c.o   -c /wrkdirs/usr/ports/net/freerdp/work/FreeRDP-2.0.0-rc4/libfreerdp/crypto/tls.c
/wrkdirs/usr/ports/net/freerdp/work/FreeRDP-2.0.0-rc4/libfreerdp/crypto/tls.c:1048:17: error: no member named 'alert_dispatch' in 'struct ssl3_state_st'
                tls->ssl->s3->alert_dispatch = 1;
                ~~~~~~~~~~~~  ^
/wrkdirs/usr/ports/net/freerdp/work/FreeRDP-2.0.0-rc4/libfreerdp/crypto/tls.c:1049:17: error: no member named 'send_alert' in 'struct ssl3_state_st'
                tls->ssl->s3->send_alert[0] = tls->alertLevel;
                ~~~~~~~~~~~~  ^
/wrkdirs/usr/ports/net/freerdp/work/FreeRDP-2.0.0-rc4/libfreerdp/crypto/tls.c:1050:17: error: no member named 'send_alert' in 'struct ssl3_state_st'
                tls->ssl->s3->send_alert[1] = tls->alertDescription;
                ~~~~~~~~~~~~  ^
/wrkdirs/usr/ports/net/freerdp/work/FreeRDP-2.0.0-rc4/libfreerdp/crypto/tls.c:1052:21: error: no member named 'wbuf' in
'struct ssl3_state_st'
                if (tls->ssl->s3->wbuf.left == 0)
                    ~~~~~~~~~~~~  ^
4 errors generated.
ninja: build stopped: subcommand failed.

[akallabeth]

@metalefty did they implement the openssl 1.1 API? Then a new define check may be necessary.

[metalefty]

LGTM. Testing.

[metalefty]

Confirmed it builds with LibreSSL 2.9.0.