Add pkg.m4.
Add pkg.m4.

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