[PATCH] libzmf: Fix installation when using Doxygen 1.14

[Christoph Grüninger]

Hello libzmf folks!

Installation of libzmf fails when the documentation is built using 
Doxygen 1.14. The latest Doxygen does no longer create PNG images and 
provides JavaScript files instead. Please find a proposed patch attached.

Further, some changes to the build system are attached, too. Pick what 
you think suitable.

Bye
Christoph

-- 
Most customers will not accept source code with compile errors in it.
                  Dan Saks, CppCon 2016 (https://youtu.be/D7Sd8A6_fYU)
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