make sure variables are initialized before use

Jan Willamowius

2019-04-21 374a60fa001de3e41c7e3d0782b4c2361479f316

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MACRO(EVAL_CONDITION name)
   IF(${ARGN})
     SET(${name} 1)
   ELSE(${ARGN})
     SET(${name} 0)
   ENDIF(${ARGN})
ENDMACRO(EVAL_CONDITION)