Initial import of libdpf.

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

thirdparty/hedley/test/concat.c

@@ -0,0 +1,22 @@
+#include "../hedley.h"
+
+#define FOO a
+#define BAR b
+
+#if HEDLEY_IAR_VERSION_CHECK(8,5,0)
+#  pragma diag_suppress=Pe1818
+#endif
+
+static int ab(int v) {
+  return v * v;
+}
+
+static int a_b(int v) {
+  return HEDLEY_CONCAT(FOO, b)(v) * v;
+}
+
+int main(int argc, const char** argv) {
+  HEDLEY_STATIC_CAST(void, argv);
+
+  return HEDLEY_CONCAT3(FOO, _, BAR)(argc);
+}