* Update libpng to 1.5.14
* Update pngcrush to 1.7.44
* Update build to the latest standards

	modified:   libs_graphics/libpng/libpng.build
	renamed:    libs_graphics/libpng/pngcrush-1.7.41-makefile.patch.xz -> libs_graphics/libpng/pngcrush-1.7.44-makefile.patch.xz