Minor changes to threading

- Renamed `cpp11_thread.cpp` to `thread.cpp`
- Removed features that are only supported by Win32 threads (`thread_wait` with timeout and mutex with spinlock)
- Fixed formatting in `thread.cpp`

src/win/Makefile.mingw

@@ -374,7 +374,7 @@ MUNTOBJ		:= midi_mt32.o \
 endif
 
 ifeq ($(CPPTHREADS), y)
-THREADOBJ	:= cpp11_thread.o
+THREADOBJ	:= thread.o
 else
 THREADOBJ	:= win_thread.o
 endif

src/win/win_opengl.c

@@ -947,7 +947,7 @@ void opengl_close(void)
 
 	SetEvent(sync_objects.closing);
 
-	thread_wait(thread, -1);
+	thread_wait(thread);
 
 	thread_close_mutex(resize_info.mutex);
 	thread_close_mutex(options.mutex);

src/win/win_thread.c

@@ -45,14 +45,11 @@ thread_create(void (*func)(void *param), void *param)
 
 
 int
-thread_wait(thread_t *arg, int timeout)
+thread_wait(thread_t *arg)
 {
     if (arg == NULL) return(0);
 
-    if (timeout == -1)
-	timeout = INFINITE;
-
-    if (WaitForSingleObject(arg, timeout)) return(1);
+    if (WaitForSingleObject(arg, INFINITE)) return(1);
 
     return(0);
 }
@@ -133,17 +130,6 @@ thread_create_mutex(void)
 }
 
 
-mutex_t *
-thread_create_mutex_with_spin_count(unsigned int spin_count)
-{
-    mutex_t *mutex = malloc(sizeof(CRITICAL_SECTION));
-
-    InitializeCriticalSectionAndSpinCount(mutex, spin_count);
-
-    return mutex;
-}
-
-
 int
 thread_wait_mutex(mutex_t *mutex)
 {