fix(lzhuf): Fix lzhuf.h header file (#137)

lzhuf.h:
  Add missing include of errno.h
  Remove dangerous commented out code to hack around missing include.

Co-authored-by: John E. Malmberg <wb8tyw@gmail.com>

libexec/lzhuf.h

@@ -1,22 +1,22 @@
 #ifndef _LZHUF_H
 #define _LZHUF_H
 
+#include <errno.h>
+#include <stdio.h>
+
 
 // Added by MARTIN
 #ifndef log
 #define log no_log
 #endif
 void no_log(int s,const char *fmt, ...);
 
-#include <stdio.h>
-
 int pwait(void *event); // Some sort of signal to let other threads run?
 
 #include <stdint.h>
 typedef int32_t int32;
 typedef int16_t int16;
 
-//#define errno 0
 #define NULLFILE 0
 
 struct lzhufstruct* AllocStruct();