fix regex to check format of client signature

Jan Willamowius

2019-04-22 4093b38f678b4d253b610f3439adb9e950e37c92

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