intuit#294: Do not use default settings in http_build_query to avoid client-side php.ini settings

[alexeycarpe]

When client has arg_separator.output different to default in php.ini it leads to incorrect api request that cannot be parsed on server side.

For example if php.ini has arg_separator.output = "&" the whole query string will be grant_type=refresh_token&refresh_token=AB11590182448aAPFaQRIOGEK3w3c5Zpi8ESwq3hGKqILRXK1A