[CMake] Bug in macro command

[Filipe Sousa]

The following code displays
-- 
-- xxx
-- Configuring done
-- Generating done

instead of 
-- xxx
-- xxx
-- Configuring done
-- Generating done

MACRO(foo var)
  SET(${var} "xxx")
ENDMACRO(foo)
 
foo(var)
MESSAGE(STATUS ${var})

foo(hello)
MESSAGE(STATUS ${hello})

I had to revert to revision 1.20 of cmMacroCommand.cxx otherwise my projects 
wont compile anymore.

-- 
Filipe Sousa
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