ZMQ_DEPRECATED doesn't fallback for unrecognized compiler

[ashish-17]

If you use a compiler outside of _MSC_VER and _GNUC__, then the if-else check doesn't provide a fallback for ZMQ_DEPRECATED macro which leads to a build failure. Specifically in my case , I am using Oracle's SunPro 5.13.0.

My suggestions is to fallback to noop in case you don't recognize a compiler. Addressed #516

[coveralls]

Pull Request Test Coverage Report for Build 1242586826

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 86.037%

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Totals
Change from base Build 1226642419:	0.0%
Covered Lines:	801
Relevant Lines:	931

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💛 - Coveralls

[gummif]

Thanks for that.