configure: Use pkg-config to check for openssl

configure

@@ -4532,7 +4532,8 @@ enabled mmal              && { check_lib interface/mmal/mmal.h mmal_port_connect
                                     check_lib interface/mmal/mmal.h mmal_port_connect ; }
                                 check_lib interface/mmal/mmal.h mmal_port_connect ; } ||
                                die "ERROR: mmal not found"; }
-enabled openssl           && { check_lib openssl/ssl.h SSL_library_init -lssl -lcrypto ||
+enabled openssl           && { check_pkg_config openssl openssl/ssl.h SSL_library_init ||
+                               check_lib openssl/ssl.h SSL_library_init -lssl -lcrypto ||
                                check_lib openssl/ssl.h SSL_library_init -lssl32 -leay32 ||
                                check_lib openssl/ssl.h SSL_library_init -lssl -lcrypto -lws2_32 -lgdi32 ||
                                die "ERROR: openssl not found"; }