[devel] Added projects/owatcom, an IDE project for OpenWatcom to replace

scripts/makefile.watcom.  This project works with OpenWatcom 1.9. The
    IDE autogenerates appropriate makefiles (libpng.mk) for batch processing.
    The project is configurable, unlike the Visual Studio project, so long
    as the developer has an awk.

projects/owatcom/pngtest.tgt

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