Relax the OpenSSL runtime version check (#313)

Allowing the runtime minor version to be higher than the one the code
was compiled against.

For instance, code was compiled with OpenSSL 3.0.x, but runtime has
3.2.x. Higher minor versions should be compatible with previous
versions: https://openssl-library.org/policies/general/versioning-policy/

Signed-off-by: Jonh Wendell <[email protected]>

Author: jwendell

bssl-compat/prefixer/prefixer.cpp

@@ -518,8 +518,8 @@ void MyFrontendAction::EndSourceFileAction() {
          << "  int minor = (version & 0x0FF00000) >> 20;" << std::endl
          << "  int patch = (version & 0x00000FF0) >> 4;" << std::endl
          << std::endl
-         << "  if ((major != ossl_OPENSSL_VERSION_MAJOR) || (minor != ossl_OPENSSL_VERSION_MINOR)) {" << std::endl
-         << "    fprintf(stderr, \"Expecting to load OpenSSL version %d.%d.x but got %d.%d.%d\\n\"," << std::endl
+         << "  if ((major != ossl_OPENSSL_VERSION_MAJOR) || (minor < ossl_OPENSSL_VERSION_MINOR)) {" << std::endl
+         << "    fprintf(stderr, \"Expecting to load OpenSSL version at least %d.%d.x but got %d.%d.%d\\n\"," << std::endl
          << "                      ossl_OPENSSL_VERSION_MAJOR," << std::endl
          << "                      ossl_OPENSSL_VERSION_MINOR," << std::endl
          << "                      major, minor, patch);" << std::endl