Updated mediawiki/extensions
Project: mediawiki/extensions/Math  4aa2741e8f7e78aa42d40a1aaf010723aabf0df7

MathJax: Ignore pagecolor command

This command was not yet supported. This implements it as a noop.
In MathJax it's not really useful to be able to define the background
color as sometimes is required in rendered png mode.

Bug 35186

Change-Id: If6573901bafd8599a01979bcbff89e52b51e4ffd