new libbb func: xmalloc_realpath (+ use it where makes sense)

syslogd, logread: add debugging code (disabled)
syslogs: drastically smaller bss; fix "-C n" behaviour

include/libbb.h

@@ -238,6 +238,7 @@ extern DIR *warn_opendir(const char *path);
 
 char *xgetcwd(char *cwd);
 char *xreadlink(const char *path);
+char *xmalloc_realpath(const char *path);
 extern void xstat(char *filename, struct stat *buf);
 extern pid_t spawn(char **argv);
 extern pid_t xspawn(char **argv);