Fixed pthread and MXML issue on OpenSuse 13.2
Fixed pthread and MXML issue on OpenSuse 13.2

On OpenSuse 13.2 MXML seems to be not prelinked with pthreads.
The changes made to CMakeLists.txt in this commit fix this issue.

chrisemblhh/nexus,chrisemblhh/nexus,chrisemblhh/nexus,nexusformat/code,nexusformat/code,chrisemblhh/nexus,nexusformat/code,nexusformat/code,nexusformat/code,chrisemblhh/nexus