MDEV-7560: wsrep* tests depend on the version of galera library

Added an include file to check galera library version.

mysql-test/suite/wsrep/include/check_galera_version.inc

@@ -0,0 +1,24 @@
+# ==== Purpose ====
+# Enable tests to check the galera library version.
+#
+# ==== Usage ====
+# --let $galera_version=25.3.6
+# source include/check_galera_lib_version.inc;
+#
+# Parameters:
+#   $galera_version
+#     Version of the galera library required by the test.
+#
+
+--disable_query_log
+
+eval SET @GALERA_VERSION=(SELECT CONCAT('$galera_version', '%'));
+
+if (!`SELECT COUNT(*) FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE
+        VARIABLE_NAME LIKE 'wsrep_provider_version' AND
+            VARIABLE_VALUE LIKE @GALERA_VERSION`)
+{
+    skip Test requires Galera library version $galera_version;
+}
+
+--enable_query_log

mysql-test/suite/wsrep/t/variables.test

@@ -28,6 +28,8 @@ CALL mtr.add_suppression("WSREP: Could not open saved state file for reading.*")
 
 --disable_query_log
 eval SET GLOBAL wsrep_provider= '$WSREP_PROVIDER';
+--let $galera_version=25.3.5
+source include/check_galera_version.inc;
 --enable_query_log
 
 --replace_column 2 #