fixed #498 - avoid potential leak in simplecpp::Macro::parseDefine()

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This fixes the issue but I am not convinced this is the full fix. It seems there is a parseDefine() call which should not be happening since a macro is being re-defined.

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This fixes the issue but I am not convinced this is the full fix. It seems there is a parseDefine() call which should not be happening since a macro is being re-defined.

The GNU compilers both only show a warning, so this fix should be fine.

a.cpp:2:9: warning: 'e' macro redefined [-Wmacro-redefined]
    2 | #define e
      |         ^
a.cpp:1:9: note: previous definition is here
    1 | #define e(...)__VA_OPT__()
      |         ^

a.cpp:2:9: warning: ‘e’ redefined
    2 | #define e
      |         ^
a.cpp:1:9: note: this is the location of the previous definition
    1 | #define e(...)__VA_OPT__()
      |         ^