Initial import of libdpf.

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

thirdparty/hedley/test/require.c

@@ -0,0 +1,20 @@
+#include "../hedley.h"
+
+#if defined(_MSC_VER)
+  HEDLEY_DIAGNOSTIC_PUSH
+  #pragma warning(disable:4668)
+  #include <limits.h>
+  HEDLEY_DIAGNOSTIC_POP
+#else
+  #include <limits.h>
+#endif
+
+static int add(int a, int b)
+  HEDLEY_REQUIRE_MSG((a < b), "a must be less than b")
+{
+  return a + b;
+}
+
+int main(void) {
+  return add(2, 3);
+}