Add stubs for GdiGetImageEncoder* and GdiGetImageDecoder* functions

[Vijay Kiran Kamuju]

ChangeLog
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Add stubs for GdiGetImageEncoder* and GdiGetImageDecoder* functions

This fix has been made by Detlef, and is posted in bugzilla.
Till now he hasnt posted this here.
I am posting this here, so It allows some applications to proceed further.
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