Initial import of libdpf.

Co-authored-by: Cursor <cursoragent@cursor.com>

thirdparty/hedley/test/fallthrough.c

@@ -0,0 +1,21 @@
+#include "../hedley.h"
+
+int main(int argc, char* argv[HEDLEY_ARRAY_PARAM(argc)]) {
+  int foo = 0;
+
+  HEDLEY_STATIC_CAST(void, argv);
+
+  switch (argc) {
+    case 2:
+      foo = 1;
+      break;
+    case 1:
+      foo = 2;
+      HEDLEY_FALL_THROUGH;
+    default:
+      foo = 3;
+      break;
+  }
+
+  return foo;
+}