Grow buffer as needed when generating SDPs (fixes #2791, see #2793) #2797
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This patch tries to address #2791 the same way we handled it in the
multistream
branch, that is by using static buffers just for the m-line, and growing the whole SDP as needed. While less flexible than #2793, this should be a simpler fix that requires no new method, and so no changes to the signatures of the methods we use.