glupload: dmabuf: only accept uploads to external-oes if supported by the context
This keeps the DirectDmabufExternal uploader from accepting buffers if texture-target=external-oes is not supported by the GL context.
Edited by Philipp Zabel
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This keeps the DirectDmabufExternal uploader from accepting buffers if texture-target=external-oes is not supported by the GL context.