build: allow libbson compilation on gcc 3.4
build: allow libbson compilation on gcc 3.4

This might not work everywhere, but worth some experimentation now since
that is available on Solaris 10. Would be nice to have stuff working
there.

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