Remove unused function

Signed-off-by: Michal Čihař <michal@cihar.com>

libraries/import.lib.php

@@ -47,23 +47,6 @@ function PMA_checkTimeout()
     }
 }
 
-/**
- * Detects what compression the file uses
- *
- * @param string $filepath filename to check
- *
- * @return string MIME type of compression, none for none
- * @access public
- */
-function PMA_detectCompression($filepath)
-{
-    $file = @fopen($filepath, 'rb');
-    if (! $file) {
-        return false;
-    }
-    return PMA\libraries\Util::getCompressionMimeType($file);
-}
-
 /**
  * Runs query inside import buffer. This is needed to allow displaying
  * of last SELECT, SHOW or HANDLER results and similar nice stuff.