[CMake] Hard to do if in Macro

[J Decker]

Why do I have to do

if( ${M__ANDROID__} EQUAL 1 OR ${M__ANDROID__} STREQUAL "ON")
endif( ${M__ANDROID__} EQUAL 1 OR ${M__ANDROID__} STREQUAL "ON")

in a macro like...
----------------------

set( __ANDROID__ 1 )

macro( test __ANDROID__ )

  if( ${__ANDROID__} EQUAL 1 OR ${__ANDROID__} STREQUAL "ON")
    message( "Included..... " )
  endif( ${__ANDROID__} EQUAL 1 OR ${__ANDROID__} STREQUAL "ON")

  if( __ANDROID__ )
    message( "ALWAYS Included ${__ANDROID__}" )
  endif( __ANDROID__ )

endmacro( test )

test( __ANDROID__ )
test( ${__ANDROID__} )
test( OFF )

----------
Output

Included.....
ALWAYS Included __ANDROID__
Included.....
ALWAYS Included 1
ALWAYS Included OFF
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