[Fontconfig] [PATCH] Rework Reporting Of Config Parse Errors To Use Callback

[Lawrence D'Oliveiro]

This patch reworks the FcConfigMessage routine in fcxml.c to pass all
messages through a callback action. The idea is that it becomes easy to
add alternate versions of the FcConfigParseAndLoadxxx routines that pass
a caller-specified callback for capturing the messages, rather than
sending them direct to stderr.

Initially I had the callback details stored as fields in the
_FcConfigParse structure. Then I discovered that messages could be
reported in situations where such a structure did not exist. So I put
them in a separate _MessageCallback structure. So this structure has to
be passed as a separate arg to every FcConfigMessage call.

Let me know what you think.
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