libmongoc 1.21.0

Bug Fixes:

• Addressed VS 2013 build failures due to missing C99 features.

Features:

• Support conditional $merge and $out aggregation on secondaries.
• Bump minimum wire protocol version from 3 (MongoDB 3.0) to 6 (MongoDB 3.6).
• Bump maximum wire protocol version from 14 (MongoDB 5.1) to 15 (MongODB 5.2).

Improvements:

• Update algorithm used for generation of OID values to reduce collisions.

libbson 1.21.0

Bug Fixes:

• Addressed VS 2013 build failures due to missing C99 features.

Improvements:

• Addressed -Wstrict-prototype warnings in bson-atomic.h.
• Addressed incompatible pointer warnings in bson-atomic.h on GCC 4.8.5.