Missing oauth_validator_libraries in variable_is_guc_list_quote()

[cca5507]

Hi,

variable_is_guc_list_quote() seems to miss oauth_validator_libraries, a GUC 
marked GUC_LIST_QUOTE.

Attach a small patch.

--
Regards,
ChangAo Chen

v1-0001-Fix-variable_is_guc_list_quote.patch
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