Review Request 48131: Fix C Reactor examples to build on windows and address signed/unsigned issues

[Kenneth Giusti]

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https://reviews.apache.org/r/48131/
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Review request for qpid, Andrew Stitcher and Chug Rolke.


Bugs: PROTON-1219
    https://issues.apache.org/jira/browse/PROTON-1219


Repository: qpid-proton-git


Description
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Fixes sender.c and receiver.c examples.


Diffs
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  examples/c/reactor/receiver.c 524c78c 
  examples/c/reactor/sender.c 850b16f 

Diff: https://reviews.apache.org/r/48131/diff/


Testing
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Thanks,

Kenneth Giusti