Supply description argument to AC_DEFINE
Supply description argument to AC_DEFINE

This avoids a possible autoheader warning when calling AC_DEFINE with less than three arguments.

See: https://lists.gnu.org/archive/html/autoconf/2009-04/msg00087.html
beingmeta/mongo-c-driver,mongodb/mongo-c-driver,ajdavis/mongo-c-driver,ajdavis/mongo-c-driver,derickr/mongo-c-driver,beingmeta/mongo-c-driver,derickr/mongo-c-driver,derickr/mongo-c-driver,jmikola/mongo-c-driver,rcsanchez97/mongo-c-driver,remicollet/mongo-c-driver,beingmeta/mongo-c-driver,ajdavis/mongo-c-driver,ajdavis/mongo-c-driver,rcsanchez97/mongo-c-driver,remicollet/mongo-c-driver,mongodb/mongo-c-driver,beingmeta/mongo-c-driver,rcsanchez97/mongo-c-driver,ajdavis/mongo-c-driver,jmikola/mongo-c-driver,jmikola/mongo-c-driver,acmorrow/mongo-c-driver,bjori/mongo-c-driver,bjori/mongo-c-driver,remicollet/mongo-c-driver,jmikola/mongo-c-driver,rcsanchez97/mongo-c-driver,remicollet/mongo-c-driver,rcsanchez97/mongo-c-driver,derickr/mongo-c-driver,rcsanchez97/mongo-c-driver,mongodb/mongo-c-driver,mongodb/mongo-c-driver,remicollet/mongo-c-driver,mongodb/mongo-c-driver,rcsanchez97/mongo-c-driver,beingmeta/mongo-c-driver,bjori/mongo-c-driver,remicollet/mongo-c-driver,acmorrow/mongo-c-driver,beingmeta/mongo-c-driver,ajdavis/mongo-c-driver,beingmeta/mongo-c-driver,jmikola/mongo-c-driver,acmorrow/mongo-c-driver,ajdavis/mongo-c-driver,bjori/mongo-c-driver,acmorrow/mongo-c-driver,mongodb/mongo-c-driver,acmorrow/mongo-c-driver,beingmeta/mongo-c-driver,acmorrow/mongo-c-driver,bjori/mongo-c-driver,bjori/mongo-c-driver,remicollet/mongo-c-driver,derickr/mongo-c-driver,acmorrow/mongo-c-driver,jmikola/mongo-c-driver,derickr/mongo-c-driver,derickr/mongo-c-driver,bjori/mongo-c-driver,mongodb/mongo-c-driver,jmikola/mongo-c-driver