[CMake] FindLibXml2.cmake: rename "LIBXML2_DEFINITIONS"

[Yaron Cohen-Tal]

Hi,

In FindLibXml2.cmake, the name of the variable "LIBXML2_DEFINITIONS" is
confusing coz it describes actually what should be added to the
"COMPILE_FLAGS" property, not "COMPILE_DEFINITIONS". I think it should b
renamed to "LIBXML2_COMPILE_FLAGS". If u wish, I can submit a patch.

Thanx,
Yaron
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