fix splash loading with wx3.0

Previously only gray square was shown. Apparently to show splash screen several calls of wx.Yield() are necessary.
Unfortunately splash.IsShowOnScreen() returns always 1 regardless of whether splash is on the screen or not.
this fix is a dirty hack. It just process all events after splash is created during 0.3 seconds.

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int CheckRetainBuffer(void)

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{

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	return 1;

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}

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void ValidateRetainBuffer(void)

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{

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}

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void InValidateRetainBuffer(void)

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{

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}

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void Retain(unsigned int offset, unsigned int count, void *p)

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{

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}

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void Remind(unsigned int offset, unsigned int count, void *p)

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{

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}