PhpCS php7 compatibility warning

Problem/Motivation

Need to have a compatible module for PHP 7.3 releases
PHPCS reports 1 warning:

FILE: /test/toolkit/dist/modules/contrib/privatemsg/privatemsg.module
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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 2016 | WARNING | Since PHP 7.0, functions inspecting arguments, like
      |         | func_get_args(), no longer report the original
      |         | value as passed to a parameter, but will instead
      |         | provide the current value. The parameter "$query"
      |         | was used, and possibly changed (by reference), on
      |         | line 2004.
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Proposed resolution

Extracting function first parameter with function_get_args()