build: fix some more warnings.
build: fix some more warnings.

alexeyvo/libbson,paulmelnikow/libbson,paulmelnikow/libbson,remicollet/libbson,mapr/libbson,bjori/libbson,remicollet/libbson,Convey-Compliance/libbson,4Second2None/libbson_tmp,jqk6/libbson,ksuarz/libbson,bjori/libbson,ajdavis/libbson,Machyne/libbson,remicollet/libbson,jqk6/libbson,rcsanchez97/libbson,mongodbinc-interns/libbson,alexeyvo/libbson,mongodb/libbson,derickr/libbson,Machyne/libbson,mongodb/libbson,rayyang2000/libbson,mongodbinc-interns/libbson,mongodbinc-interns/libbson,4Second2None/libbson_tmp,4Second2None/libbson_tmp,paulmelnikow/libbson,Machyne/libbson,ajdavis/libbson,ajdavis/libbson,derickr/libbson,rayyang2000/libbson,Convey-Compliance/libbson,rayyang2000/libbson,bjori/libbson,jqk6/libbson,mongodbinc-interns/libbson,remicollet/libbson,paulmelnikow/libbson,mapr/libbson,derickr/libbson,paulmelnikow/libbson,jqk6/libbson,alexeyvo/libbson,derickr/libbson,4Second2None/libbson_tmp,Convey-Compliance/libbson,mongodb/libbson,Machyne/libbson,rayyang2000/libbson,ksuarz/libbson,rcsanchez97/libbson,ksuarz/libbson,rcsanchez97/libbson,mapr/libbson