[xml] minor compile warnings

["Hannes Eder" <Hannes HannesEder net>]

the attached patch fixes the warnings below in libxml2-2.6.28:

compiler: gcc (GCC) 3.4.4 (cygming special, gdc 0.12, using dmd 0.125)
and yes ... it's cygwin ;)

encoding.c:1706: warning: passing arg 2 of `libiconv' from
incompatible pointer type
threads.c:431: warning: unused variable `err'
xmlsave.c:837: warning: unused variable `handler'
tree.c:4851: warning: passing arg 1 of pointer to function discards
qualifiers from pointer target type

-Hannes

Attachment: fixwarnings-200711221.patch
Description: Binary data