testrunner-lite: Fix xml2 compilation error.
testrunner-lite: Fix xml2 compilation error.

[testrunner-lite] Fix xml2 compilation error. Fixes JB#47143

Signed-off-by: Matti Kosola <3feee66a608ed39223b9029a25c4705ee87157e0@jolla.com>

mer-tools/testrunner-lite,mer-tools/testrunner-lite