Initial import of libdpf.

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

thirdparty/hedley/test/stringify.c

@@ -0,0 +1,27 @@
+#include "../hedley.h"
+
+#define PREFIX foo_
+#define BAR bar
+
+static int
+my_strcmp(const char* s1, const char* s2) {
+  while (1) {
+    if (*s1 < *s2)
+      return -1;
+    else if (*s1 > *s2)
+      return 1;
+    else if (*s1 == '\0')
+      return 0;
+    s1++;
+    s2++;
+  }
+}
+
+static const char*
+foo_bar(void) {
+  return HEDLEY_STRINGIFY(BAR);
+}
+
+int main(void) {
+  return my_strcmp("bar", HEDLEY_CONCAT(PREFIX, BAR)());
+}