Updated: poco-1.7.3-2

[David Stacey]

The following packages have been updated in the Cygwin distribution:

* libpoco-devel-1.7.3-2
* libpoco43-1.7.3-2
* poco-1.7.3-2
* poco-doc-1.7.3-2

The POCO C++ Libraries are open source C++ class libraries that
simplify and accelerate the development of network-centric, portable
applications in C++.

This build reinstates the Data/MySQL, Data/ODBC and MongoDB components.
These components are no longer built by default and so were omitted
from the previous build.

Note that users of the 'Poco::UTF32String' class should compile using
the '-frepo' g++ compiler switch. Details here:
https://cygwin.com/ml/cygwin/2015-04/msg00130.html

Dave.