MDEV-24308: Revert for Windows

For some reason, InnoDB debug tests on Windows fail due to rw_lock_t
if the function call overhead for some os_thread_ code is removed.

This change worked fine on Windows in combination with MDEV-24142.

storage/innobase/include/os0thread.h

@@ -66,9 +66,15 @@ typedef void* (*os_posix_f_t) (void*);
 typedef unsigned int    mysql_pfs_key_t;
 #endif /* HAVE_PSI_INTERFACE */
 
-#define os_thread_eq(a,b) IF_WIN(a == b, pthread_equal(a, b))
-#define os_thread_yield() IF_WIN(SwitchToThread(), sched_yield())
-#define os_thread_get_curr_id() IF_WIN(GetCurrentThreadId(), pthread_self())
+#ifndef _WIN32
+#define os_thread_eq(a,b) pthread_equal(a, b)
+#define os_thread_yield() sched_yield()
+#define os_thread_get_curr_id() pthread_self()
+#else
+bool os_thread_eq(os_thread_id_t a, os_thread_id_t b);
+void os_thread_yield();
+os_thread_id_t os_thread_get_curr_id();
+#endif
 
 /****************************************************************//**
 Creates a new thread of execution. The execution starts from

storage/innobase/os/os0thread.cc

@@ -27,6 +27,12 @@ Created 9/8/1995 Heikki Tuuri
 #include "univ.i"
 #include "srv0srv.h"
 
+#ifdef _WIN32
+bool os_thread_eq(os_thread_id_t a, os_thread_id_t b) { return a == b; }
+void os_thread_yield() { SwitchToThread(); }
+os_thread_id_t os_thread_get_curr_id() { return GetCurrentThreadId(); }
+#endif
+
 /****************************************************************//**
 Creates a new thread of execution. The execution starts from
 the function given.