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Print file paths in a platform-independent way

Conversion may be unspecified, but Windows better do the right thing (or else.)

--- a/src/gfx/main.cpp

+++ b/src/gfx/main.cpp

@@ -296,7 +296,13 @@

 		        options.maxNbTiles[0], options.maxNbTiles[1]);

 		auto printPath = [](char const *name, std::filesystem::path const &path) {

 			if (!path.empty()) {

-				fprintf(stderr, "\t%s: %s\n", name, path.c_str());

+#ifdef _MSC_VER

+	#define PRIpath "ls"

+#else

+	#define PRIpath "s"

+#endif

+				fprintf(stderr, "\t%s: %" PRIpath "\n", name, path.c_str());

+#undef PRIpath

 			}

 		};

 		printPath("Input image", options.input);