Problem: Draft build not enabled for git cloned cppzmq.

[kurdybacha]

When cppzmq is build out of source e.g. ${CMAKE_SOURCE_DIR}/build:

mkdir build
cd build
cmake ..

then .git is not found properly, DRAFT build not enabled and poller test
not added to pool of tests.

[coveralls]

Pull Request Test Coverage Report for Build 8

• 0 of 0 (NaN%) changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 54.839%

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Totals
Change from base Build 7:	0.0%
Covered Lines:	17
Relevant Lines:	31

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💛 - Coveralls