winex11.drv: import X11's "text/html" as "HTML Format" (try 2)

Thu Jul 24 13:07:26 CDT 2014

Implements proper importing of "text/html" into Windows's "HTML
Format". Does conversion from (Firefox's) UTF16-LE with BOM into UTF-8
w/o BOM if necessary, rewrites the HTML with libxml2 to generate a
complete HTML document with <HTML> and <BODY> tags, finds the location
of the <BODY> tag and uses its contents surrounded by
 and  comments for the
StartFragment/EndFragment addresses.

Fixes pasting rich text into a large number of apps and closes #7372.

Try 2 doesn't use C99 features, correctly calculates lengths of
unsigned ints in the HTML Format description as 10 instead of 8 bytes,
and has a better worded error message if libxml2 wasn't available at
compile time.

Feedback is appreciated.

Damjan Jovanovic
---
 dlls/winex11.drv/Makefile.in |   4 +-
 dlls/winex11.drv/clipboard.c | 157 ++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 158 insertions(+), 3 deletions(-)
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