add launchpad bug reports without comments

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+Qemu guest fails to write files with raw disk (like \\.\PhysicalDrive1) on Windows host.
+
+Qemu guest fails to write files with specifing raw disk like \\.\PhysicalDrive1
+full command line is below.
+qemu-sysytem-i386.exe -kernel bzImage -drive file=rootfs.ext2,index=0,if=scsi -append root=/dev/sda -drive file=\\.\PhysicalDrive1,index=1,if=scsi
+
+I found the reason is below aio_worker returns -EIO when flush operation.
+
+https://github.com/qemu/qemu/blob/master/block/raw-win32.c#L95
+
+static int aio_worker(void *arg)
+...
+    case QEMU_AIO_FLUSH:
+        if (!FlushFileBuffers(aiocb->hfile)) {
+            return -EIO;
+        }
+
+FlushFileBuffers always fails with GetLastError() == ERROR_INVALID_FUNCTION
+I think this function doesn't support raw device.
+For flushing, you might have to issue scsi/ata command or use another way.
+Trying to just ignoring this error, writing function seems to be fine for me.
+
+Thanks
+hiroaki
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