Fixups to copile on more platforms

Author: rfm

Source/NSOperation.m

@@ -619,14 +619,12 @@ - (void) main
 
 @interface	NSOperationQueue (Private)
 - (void) _execute;
-- (void) _main: (NSOperation *)op;
-#if GS_USE_LIBDISPATCH == 1
 - (id) _initMainQueue;
-#endif
 - (NSRecursiveLock *) _internalLock;
 - (NSMutableArray *) _internalOperations;
 - (NSMutableArray *) _internalWaiting;
 - (NSInteger *) _internalExecutingPtr;
+- (void) _main: (NSOperation *)op;
 
 - (void) observeValueForKeyPath: (NSString *)keyPath
 		       ofObject: (id)object
@@ -1216,6 +1214,18 @@ - (void) waitUntilAllOperationsAreFinished
 
 @implementation	NSOperationQueue (Private)
 
+- (id) _initMainQueue
+{
+  if ((self = [self init]) != nil)
+    {
+      [internal->lock lock];
+      internal->maxThreads = 1;
+      [internal->queueImpl initAsMainQueue];
+      [internal->lock unlock];
+    }
+  return self;
+}
+
 - (NSRecursiveLock *) _internalLock
 {
   return internal->lock;