Fix build with libxml2 >= 2.12.0

libxml2 2.12.0 added const to one of the arguments of the error
callback function, changing its signature. Check the libxml2 version
so the function definition uses

Fix build with libxml2 >= 2.12.0

libxml2 2.12.0 added const to one of the arguments of the error
callback function, changing its signature. Check the libxml2 version
so the function definition uses the proper type to fix the build
breakage.

(cherry picked from commit 523491489b0a7126864a6de1be3e6e170549602a)
(cherry picked from commit a2201880d8674fe5a1a815270d3a2617a2ef18df)

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#i124131# use smart pointer's bool operator instead of comparing its content against NULL

this makes the code more typesafe and avoids the -Wnull-conversion warnings
seen with boost>=1.55 smart poin

#i124131# use smart pointer's bool operator instead of comparing its content against NULL

this makes the code more typesafe and avoids the -Wnull-conversion warnings
seen with boost>=1.55 smart pointers in C+11 enabled build environments


git-svn-id: https://svn.apache.org/repos/asf/openoffice/trunk@1562080 13f79535-47bb-0310-9956-ffa450edef68

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