CDRIVER-624 fix clang version check
CDRIVER-624 fix clang version check

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