emulators/yuzu: unbreak on FreeBSD < 12 after r540846

• Could NOT find OpenSSL, try to set the path to OpenSSL root folder in the system variable OPENSSL_ROOT_DIR: Found unsuitable version "1.0.2s", but required is at least "1.1" (found /usr/lib/libcrypto.so)
• Packages openssl/1.1.1f not found!
• Downloading conan.cmake from https://github.com/conan-io/cmake-conan

CMake Error at CMakeLists.txt:256 (conan_check):

Unknown CMake command "conan_check".