rearrange, all fuzzers now call fuzzer_set_input()

--HG--
branch : fuzz

fuzz-wrapfd.h

@@ -10,7 +10,8 @@ enum wrapfd_mode {
     RANDOMIN,
 };
 
-void wrapfd_setup(uint32_t wrapseed);
+void wrapfd_setup();
+void wrapfd_setseed(uint32_t seed);
 // doesn't take ownership of buf. buf is optional.
 void wrapfd_add(int fd, buffer *buf, enum wrapfd_mode mode);