Merge branch 'update/cjson_v1_7_12_v4.0' into 'release/v4.0'

Update cJSON to v1.7.12 (v4.0)

See merge request espressif/esp-idf!5850
This commit is contained in:
Jiang Jiang Jian
2019-09-02 12:41:30 +08:00