Remove unused "read_config_file" function

src/mibew/libs/common/configurations.php

@@ -15,22 +15,6 @@
  * limitations under the License.
  */
 
-/**
- * Read and parse configuration ini file
- *
- * @param string $file Path to Configuration file
- * @return boolean|array Array of configurations or boolean false if file can
- *   not be read.
- */
-function read_config_file($file)
-{
-    if (!is_readable($file)) {
-        return false;
-    }
-
-    return parse_ini_file($file, true);
-}
-
 /**
  * Loads system configurations.
  *