configure: replace openssl header check with 1.1.1 API

Fix #20571

Avoid build errors with openssl forks (like libressl)
that lack some APIs.

This patch replace header check for OPENSSL_init_ssl
(was added in 1.1.0) with the OpenSSL 1.1.1 new API
DTLS_get_data_mtu.

Signed-off-by: Jack Lau <jacklau1222gm@gmail.com>
(cherry picked from commit 0486ad61ce)

Changelog

@@ -83,6 +83,7 @@ version 8.0:
 - Whisper filter
 - Drop support for OpenSSL < 1.1.0
 - Enable TLS peer certificate verification by default (on next major version bump)
+- Drop support for OpenSSL < 1.1.1
 - yasm support dropped, users need to use nasm
 - VVC VAAPI decoder
 - RealVideo 6.0 decoder

configure

@@ -7262,13 +7262,13 @@ enabled omx_rpi           && { test_code cc OMX_Core.h OMX_IndexConfigBrcmVideoR
 enabled omx               && require_headers OMX_Core.h && \
     warn "The OpenMAX encoders are deprecated and will be removed in future versions"
 
-enabled openssl           && { { check_pkg_config openssl "openssl >= 3.0.0" openssl/ssl.h OPENSSL_init_ssl &&
+enabled openssl           && { { check_pkg_config openssl "openssl >= 3.0.0" openssl/ssl.h DTLS_get_data_mtu &&
                                  { enabled gplv3 || ! enabled gpl || enabled nonfree || die "ERROR: OpenSSL >=3.0.0 requires --enable-version3"; }; } ||
                                { enabled gpl && ! enabled nonfree && die "ERROR: OpenSSL <3.0.0 is incompatible with the gpl"; } ||
-                               check_pkg_config openssl "openssl >= 1.1.0" openssl/ssl.h OPENSSL_init_ssl ||
-                               check_lib openssl openssl/ssl.h OPENSSL_init_ssl -lssl -lcrypto ||
-                               check_lib openssl openssl/ssl.h OPENSSL_init_ssl -lssl -lcrypto -lws2_32 -lgdi32 ||
-                               die "ERROR: openssl (>= 1.1.0) not found"; }
+                               check_pkg_config openssl "openssl >= 1.1.1" openssl/ssl.h DTLS_get_data_mtu ||
+                               check_lib openssl openssl/ssl.h DTLS_get_data_mtu -lssl -lcrypto ||
+                               check_lib openssl openssl/ssl.h DTLS_get_data_mtu -lssl -lcrypto -lws2_32 -lgdi32 ||
+                               die "ERROR: openssl (>= 1.1.1) not found"; }
 enabled pocketsphinx      && require_pkg_config pocketsphinx pocketsphinx pocketsphinx/pocketsphinx.h ps_init
 enabled rkmpp             && { require_pkg_config rkmpp rockchip_mpp  rockchip/rk_mpi.h mpp_create &&
                                require_pkg_config rockchip_mpp "rockchip_mpp >= 1.3.7" rockchip/rk_mpi.h mpp_create &&
@@ -7277,15 +7277,6 @@ enabled rkmpp             && { require_pkg_config rkmpp rockchip_mpp  rockchip/r
                              }
 enabled vapoursynth       && require_headers "vapoursynth/VSScript4.h vapoursynth/VapourSynth4.h"
 
-enabled openssl            && {
-    enabled whip_muxer && {
-        $pkg_config --exists --print-errors "openssl >= 1.0.1k" ||
-        require_pkg_config openssl "openssl >= 1.0.1k" openssl/ssl.h SSL_library_init ||
-        require_pkg_config openssl "openssl >= 1.0.1k" openssl/ssl.h OPENSSL_init_ssl
-    }
-}
-
-
 if enabled gcrypt; then
     GCRYPT_CONFIG="${cross_prefix}libgcrypt-config"
     if "${GCRYPT_CONFIG}" --version > /dev/null 2>&1; then