Updated mediawiki/extensions
Project: mediawiki/extensions/Math  0c3f9d69fefcefe8abb0b8b80e2d1740093d0638

Bug fix for `\varcoppa` in texvccheck

A backslash was missing from the translation of `\varcoppa`.

Change-Id: Ic987f1a67ac73395d7ee16e7f8bcd38a6bad6e11