Add ktx

ktx/external/fmt/test/find-package-test/main.cc

@@ -0,0 +1,5 @@
+#include "fmt/format.h"
+
+int main(int argc, char** argv) {
+  for (int i = 0; i < argc; ++i) fmt::print("{}: {}\n", i, argv[i]);
+}