cmake HAVE_NUMDIFF examples

QMCPACK/qmcpack src/QMCTools/ppconvert/test/Oxygen/CMakeLists.txt :12 

find_program(HAVE_NUMDIFF numdiff)

QMCPACK/qmcpack src/QMCTools/ppconvert/test/Oxygen/CMakeLists.txt :20 

endif(HAVE_NUMDIFF)