fix/compile: does not compile under fedora 31, extern + static definitions of gettid()

libcoz/ccutil/thread.h

@@ -1,17 +0,0 @@
-#if !defined(CCUTIL_THREAD_H)
-#define CCUTIL_THREAD_H
-
-// gettid() is provided by glibc since version 2.30
-// only create our own implementation for older glibc versions
-#include <features.h>
-#if !__GLIBC_PREREQ(2,30)
-
-#include <sys/syscall.h>
-
-static inline pid_t gettid() {
-  return syscall(__NR_gettid);
-}
-
-#endif
-
-#endif

libcoz/ccutil/timer.h

@@ -3,9 +3,9 @@
 
 #include <string.h>
 #include <time.h>
+#include <unistd.h>
 
 #include "log.h"
-#include "thread.h"
 
 class timer {
 public:

libcoz/perf.cpp

@@ -25,7 +25,6 @@
 
 #include "ccutil/log.h"
 #include "ccutil/spinlock.h"
-#include "ccutil/thread.h"
 #include "ccutil/wrapped_array.h"
 
 using ccutil::wrapped_array;