CDRIVER-2712 remove deprecated MD5 API (#1912)

Author: kevinAlbs

NEWS

@@ -3,14 +3,18 @@ Unreleased (2.0.0)
 
 ## Changes
 
-
 * Passing `batchSize:0` as an option to `mongoc_client_watch`, `mongoc_database_watch`, or `mongoc_collection_watch`
   now applies `batchSize:0` to the `aggregate` command. Useful to request an immediate cursor. Previously the value
   was ignored.
 * `bson_oid_init_sequence` is removed. Use `bson_oid_init` instead.
 
 ## Removals
 
+* The `bson_md5_t` struct and associated API is removed.
+* The client side matching feature, `mongoc_matcher_t` and related functions are removed.
+
+### Forwarding headers (`#include <bson.h>` and `#include <mongoc.h>`)
+
 The compatibility "forwarding" headers have been removed (previously added in 1.13.0). This means it is no longer valid to include the literal header names `mongoc.h` or `bson.h` directly:
 
 ```c
@@ -25,8 +29,6 @@ Instead, the names must be prefixed with the parent directory: `mongoc/mongoc.h`
 #include <mongoc/mongoc.h>
 ```
 
-### `mongoc_matcher_t`
-The client side matching feature, `mongoc_matcher_t` and related functions are removed.
 
 libmongoc 1.30.2
 ================

src/common/src/common-md5-private.h

@@ -23,6 +23,12 @@
 
 BSON_BEGIN_DECLS
 
+typedef struct {
+   uint32_t count[2]; /* message length in bits, lsw first */
+   uint32_t abcd[4];  /* digest buffer */
+   uint8_t buf[64];   /* accumulate block */
+} bson_md5_t;
+
 #define mcommon_md5_init COMMON_NAME (md5_init)
 #define mcommon_md5_append COMMON_NAME (md5_append)
 #define mcommon_md5_finish COMMON_NAME (md5_finish)

src/libbson/src/bson/bson-md5.c

@@ -36,7 +36,6 @@
 #include <bson/bson-iter.h>
 #include <bson/bson-json.h>
 #include <bson/bson-keys.h>
-#include <bson/bson-md5.h>
 #include <bson/bson-memory.h>
 #include <bson/bson-oid.h>
 #include <bson/bson-reader.h>