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Clarify the comment about ABI issues with WelsGetCodecVersion

The incompatibility between mingw and msvc is smaller than it seemed
at first; this turned out to only be a bug in older versions.

--- a/codec/api/svc/codec_api.h

+++ b/codec/api/svc/codec_api.h

@@ -532,7 +532,9 @@

 void WelsDestroyDecoder (ISVCDecoder* pDecoder);

 /** @brief   Get codec version

- *           Note, this function isn't ABI compatible between MSVC and Mingw.

+ *           Note, old versions of Mingw (GCC < 4.7) are buggy and use an

+ *           incorrect/different ABI for calling this function, making it

+ *           incompatible with MSVC builds.

  *  @return  The linked codec version

 */

 OpenH264Version WelsGetCodecVersion (void);