Revert "looks like the built-in classes are still checked against in pyjslib, so always generate __md5__ hashes for them, even if function argument checking is turned off"
Revert "looks like the built-in classes are still checked against in pyjslib, so always generate __md5__ hashes for them, even if function argument checking is turned off"

This reverts commit 0b48c7f5e5b07fc5edd3d7b17925e71e271f98c8.

pyjs/pyjs,lancezlin/pyjs,anandology/pyjamas,Hasimir/pyjs,Hasimir/pyjs,minghuascode/pyj,Hasimir/pyjs,gpitel/pyjs,gpitel/pyjs,anandology/pyjamas,lancezlin/pyjs,pombredanne/pyjs,pombredanne/pyjs,spaceone/pyjs,lancezlin/pyjs,anandology/pyjamas,minghuascode/pyj,minghuascode/pyj,spaceone/pyjs,Hasimir/pyjs,gpitel/pyjs,minghuascode/pyj,spaceone/pyjs,pyjs/pyjs,lancezlin/pyjs,anandology/pyjamas,pyjs/pyjs,gpitel/pyjs,spaceone/pyjs,pyjs/pyjs,pombredanne/pyjs,pombredanne/pyjs