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glmixer: Add GL_SYNC_META option to bufferpool

Yu Shengqi requested to merge Shengqi.Yu/gstreamer:Add-GL_SYNC_META-api-to-allocation-query into main

when pipline is glvideomixerelement->glcolorconvertelement->gldownloadelement and glcolorconvertelement is not passthrough, the gl bufferpool between glvideomixerelement and glcolorconvertelement will not add gl sync meta during allocating buffer. This will cause that glcolorconvert's inbuf has no sync meta to wait for.

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