Mark that this fails to build on a recent HEAD.

Quota.xs:162:41: error: use of undeclared identifier 'RQUOTA_GRPQUOTA'

ext_gq_args.gqa_type = ((kind != 0) ? GQA_TYPE_GRP : GQA_TYPE_USR);
                                      ^

./myconfig.h:75:22: note: expanded from macro 'GQA_TYPE_GRP'

^

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