Modified the WINPR_JSON_AddItemToArray function to not expect a return value from cJSON_AddItemToArray. WINPR_JSON_AddItemToArray failure is given by the same conditions that cause add_item_to_array. add_item_to_array is a private cJSON function called by cJSON_AddItemToArray. The logic analysis is based on cJSON 1.7.12, which is the last release before cJSON_AddItemToArray's signature changed to include a bool return. See https://github.com/DaveGamble/cJSON/blob/v1.7.12/cJSON.c line: 1848.
as we now support cJSON and json-c we need to wrap the functions we use.
also allows drop in replacements for older cJSON versions lacking
certain functions.
