Fixed Windows builds by removing the __attribute__((unused)) construct.

sysbench/scripting/script_lua.c

@@ -234,10 +234,12 @@ int sb_lua_init(void)
   return 0;
 }
 
-sb_request_t sb_lua_get_request(int __attribute__((unused))thread_id)
+sb_request_t sb_lua_get_request(int thread_id)
 {
   sb_request_t req;
 
+  (void) thread_id; /* unused */
+
   if (sb_globals.max_requests != 0 && nevents >= sb_globals.max_requests)
   {
     req.type = SB_REQ_TYPE_NULL;

sysbench/tests/cpu/sb_cpu.c

@@ -97,10 +97,12 @@ int cpu_init(void)
 }
 
 
-sb_request_t cpu_get_request(int __attribute__ ((unused)) thread_id)
+sb_request_t cpu_get_request(int thread_id)
 {
   sb_request_t req;
-  
+
+  (void) thread_id; /* unused */
+
   if (sb_globals.max_requests > 0 && req_performed >= sb_globals.max_requests)
   {
     req.type = SB_REQ_TYPE_NULL;

sysbench/tests/memory/sb_memory.c

@@ -216,11 +216,13 @@ int memory_init(void)
 }
 
 
-sb_request_t memory_get_request(int thread_id __attribute__((unused)))
+sb_request_t memory_get_request(int thread_id)
 {
   sb_request_t      req;
   sb_mem_request_t  *mem_req = &req.u.mem_request;
-  
+
+  (void) thread_id; /* unused */
+
   SB_THREAD_MUTEX_LOCK();
   if (total_bytes >= memory_total_size)
   {

sysbench/tests/threads/sb_threads.c

@@ -138,11 +138,13 @@ int threads_cleanup(void)
 }
 
 
-sb_request_t threads_get_request(int thread_id __attribute__((unused)))
+sb_request_t threads_get_request(int thread_id)
 {
   sb_request_t         sb_req;
   sb_threads_request_t *threads_req = &sb_req.u.threads_request;
 
+  (void) thread_id; /* unused */
+
   SB_THREAD_MUTEX_LOCK();
   if (sb_globals.max_requests > 0 && req_performed >= sb_globals.max_requests)
   {