[Libvir] [PATCH] Enhance virBuffer code

[Richard W.M. Jones]

Apart from a couple of minor fixes, this adds the following useful 
functions to the virBuffer implementation:

virBufferAddChar: Append a single character to the buffer.

virBufferURIEncodeString: Append a %-encoded string to the buffer (eg. 
virBufferEscapeString and the similar function in libxml2).

Rich.

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