Install bson-dsl.h
https://jira.mongodb.org/browse/CDRIVER-4673
--- src/libbson/CMakeLists.txt.orig	2023-06-21 07:31:37.000000000 -0500
+++ src/libbson/CMakeLists.txt	2023-07-05 13:00:51.000000000 -0500
@@ -184,6 +184,7 @@
    ${PROJECT_SOURCE_DIR}/src/bson/bson-endian.h
    ${PROJECT_SOURCE_DIR}/src/bson/bson-error.h
    ${PROJECT_SOURCE_DIR}/src/bson/bson.h
+   ${PROJECT_SOURCE_DIR}/src/bson/bson-dsl.h
    ${PROJECT_SOURCE_DIR}/src/bson/bson-iter.h
    ${PROJECT_SOURCE_DIR}/src/bson/bson-json.h
    ${PROJECT_SOURCE_DIR}/src/bson/bson-keys.h