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Provide fallbacks for use of mb_convert_encoding() in HtmlFormatter

Authored by Anomie.

Description

Provide fallbacks for use of mb_convert_encoding() in HtmlFormatter

Since we don't strictly require mbstring in core, provide fallbacks for
the use of mb_convert_encoding() to go to/from 'HTML-ENTITIES' in
HtmlFormatter.

This fixes the api help page on REL1_25, which wasn't depending
on it on REL1_24

Bug: T62174
Change-Id: I2dcde96e0e68a7d141f2ba79558b20e1d9c799ec
(cherry picked from commit 21ae7bdb3a48be60f1ce75979ccd31111c256af3)