Replace all CROAK calls with assert or LOG_FATAL

Remove croak() and use assert() or LOG_FATAL() everywhere. Hopefully
the problems with debugging mentioned in the croak() comment are long gone.

logging.h

@@ -63,6 +63,7 @@ typedef enum {
   LOGF_Regress,
   LOGF_Sys,
   LOGF_SysLinux,
+  LOGF_SysNetBSD,
   LOGF_SysSolaris,
   LOGF_SysSunOS,
   LOGF_SysWinnt,
@@ -100,15 +101,6 @@ extern int LOG_RateLimited(void);
 #define LOG_FATAL LOG_Position(__FILE__, __LINE__, ""); LOG_Fatal_Function
 #endif /* defined (__GNUC__) */
 
-/* Like assert(0) */
-
-#if defined(LINUX) && defined(__alpha__)
-#define CROAK(message) assert(0) /* Added JGH Feb 24 2001  FIXME */
-#else
-extern int croak(const char *file, int line, const char *msg);
-#define CROAK(message) croak(__FILE__, __LINE__, message);
-#endif
-
 /* File logging functions */
 
 typedef int LOG_FileID;