Remove unused function qp()

include/text.php

@@ -17,16 +17,6 @@ function activity_match($haystack,$needle) {
 	return (($haystack === $needle) || ((basename($needle) === $haystack) && strstr($needle, NAMESPACE_ACTIVITY_SCHEMA)));
 }
 
-/**
- * quick and dirty quoted_printable encoding
- *
- * @param string $s
- * @return string
- */
-function qp($s) {
-	return str_replace("%", "=", rawurlencode($s));
-}
-
 /**
  * @brief Given a text string, convert from bbcode to html and add smilie icons.
  *