phpcs-variable-analysis
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Remove php_errormsg from superglobals
As pointed out by @jrfnl in https://github.com/sirbrillig/phpcs-variable-analysis/pull/207, which added some missing superglobals, $php_errormsg is only available conditionally, and even then is deprecated. Therefore I think we should remove it from the list of superglobals that we ignore.