Emacs and last libpng release

[Angelo Graziosi]

After this update: https://cygwin.com/ml/cygwin/2015-02/msg00126.html, 
building Emacs (from master) fails because 'ld' does not find '-lpng15'...

Installing libpng15-devel fixes the build but I wonder if there is a 
better way to do this..

TIA,
 Angelo.

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