Remove ENABLE_DRAFTS option

[stephanlachnit]

This option added ZMQ_BUILD_DRAFT_API to the compile definitions. However, this should be propagated by libzmq (see https://github.com/zeromq/libzmq/pull/4323 and https://github.com/zeromq/cppzmq/issues/477).

Closes https://github.com/zeromq/cppzmq/issues/477.

[coveralls]

Pull Request Test Coverage Report for Build 6957349874

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 6 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.6%) to 86.354%

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Files with Coverage Reduction	New Missed Lines	%
zmq.hpp	6	82.88%
<!--	Total:	6		-->

Totals
Change from base Build 6697216186:	-0.6%
Covered Lines:	848
Relevant Lines:	982

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💛 - Coveralls

[gummif]

This change will probably break something for someone using slightly older versions of libzmq.

[stephanlachnit]

This change will probably break something for someone using slightly older versions of libzmq.

Yes, I would recommend merging this change only after a new release of libzmq (the commit in question is not part of a release yet), since it is fairly reasonable to expect people not to take a new version of cppzmq and an old version libzmq.

[stephanlachnit]

@gummif since libzmq v4.3.5 has been released with https://github.com/zeromq/libzmq/issues/4194 included, this can merged now

[stephanlachnit]

I also updated the CI to use 4.3.5. to actually use this change.

[gummif]

Sorry for the delay. I will see if I have time soon to do a review.

[stephanlachnit]

@gummif friendly ping to check this :) This is quite a small change

[gummif]

OK I think this looks good. In the unlikely scenario someone has problem with enabling drafts (using older version of libzmq built with drafts and new version of cppzmq) they just need to add target_compile_definitions(${target} PUBLIC ZMQ_BUILD_DRAFT_API) to their cmake project.