fix build with OpenSSL 3.1 (#3929)

submodules/CMakeLists.txt

@@ -20,7 +20,7 @@ if(QUIC_TLS STREQUAL "openssl" OR QUIC_TLS STREQUAL "openssl3")
         set(QUIC_OPENSSL openssl)
     else()
         set(QUIC_USE_OPENSSL3 ON)
-        message(STATUS "Configuring for OpenSSL 3.0")
+        message(STATUS "Configuring for OpenSSL 3.x")
         set(EXPECTED_OPENSSL_VERSION 3.0)
         set(QUIC_OPENSSL openssl3)
     endif()
@@ -343,7 +343,11 @@ else()
             # We cannot use VERSION_GREATER as 3.0 would work for 1.1.1 but they are not compatible.
             string(FIND ${OPENSSL_VERSION} "." VERSIONLEN REVERSE)
             string(SUBSTRING ${OPENSSL_VERSION} 0 ${VERSIONLEN}  OPENSSL_MAJORMINOR)
-            if (OPENSSL_VERSION VERSION_EQUAL EXPECTED_OPENSSL_VERSION OR OPENSSL_MAJORMINOR VERSION_EQUAL EXPECTED_OPENSSL_VERSION)
+            string(FIND ${OPENSSL_VERSION} "." VERSIONLEN)
+            string(SUBSTRING ${OPENSSL_VERSION} 0 ${VERSIONLEN}  OPENSSL_MAJOR)
+            if (OPENSSL_VERSION VERSION_EQUAL EXPECTED_OPENSSL_VERSION OR OPENSSL_MAJORMINOR VERSION_EQUAL EXPECTED_OPENSSL_VERSION OR 
+                # 3.1 is compatible with 3.0, 3.2 and beyond maybe as well.
+                (EXPECTED_OPENSSL_VERSION VERSION_EQUAL "3.0" AND OPENSSL_MAJOR EQUAL "3"))
                 target_link_libraries(OpenSSLQuic INTERFACE OpenSSL::Crypto)
             else()
                 message(FATAL_ERROR "OpenSSL ${EXPECTED_OPENSSL_VERSION} not found, found ${OPENSSL_VERSION}")