jsminplus PHP 7 compatibility

If @codingStandardsIgnoreFile is removed from the jsminplus.inc file then we can find below warning using php compatibility test

/bin/phpcs --standard=PHPCompatibility --extensions=php,inc,module,install,test,profile,theme --runtime-set testVersion 7.3 path/to/file

FILE: ...standard/modules/contrib/advagg/advagg_js_compress/jsminplus.inc
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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1822 | 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 "$t" was
| | used, and possibly changed (by reference), on line
| | 1809.
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