Change rungbuf.h to ALWAYS include threadwrap.h...

NOTES:
------
startup.h has an ugly YIELD kludge in it, and includes both ringbuf.h and
threadwrap.h.  However, it is sometimes used in non-threaded utils.
This must be fixed!

src/sbbs3/ringbuf.h

@@ -42,9 +42,10 @@
 #ifndef _RINGBUF_H_
 #define _RINGBUF_H_
 
-#ifdef RINGBUF_MUTEX
+/* #ifdef RINGBUF_MUTEX */
+/* Needed for YIELD() definition also are ringbuffers ever used in non-threaded bits? */
 #include "threadwrap.h"
-#endif
+/* #endif */
 
 #ifndef DWORD
 #define DWORD unsigned long

src/sbbs3/startup.h

@@ -45,11 +45,9 @@
 #include "client.h"
 #include "ringbuf.h"
 #include "threadwrap.h"	/* sem_t */
-#if defined(_PTH_PTHREAD_H_) && ! defined(SBBS) /* Ugly hack around the use of startup.h including threadwrap.h */
+#if defined(SBBS) /* Ugly hack around the use of startup.h including threadwrap.h */
 	/* Leave the warning here as incentive to fix it correctly! */
-	#define SLEEP(x)		({	int y=x; struct timeval tv; \
-								tv.tv_sec=(y/1000); tv.tv_usec=((y%1000)*1000); \
-								select(0,NULL,NULL,NULL,&tv); })
+	#define YIELD()
 #endif
 
 typedef struct {