[Rpm-maint] [rpm-software-management/rpm] Add builtin macro %undefine_all (#820)

[pavlinamv]

A builtin macro 
```%undefine macro_name``` 
removes the last defined _'macro_name'_ from defined macros. But it still leaves all older definitions of the macro _'macro_name'_. So as @pmatilai wrote in #115 - "macros stack so undefining doesn't guarantee said macro actually goes away". 

Thus I think that it will be usefull to have a builtin macro that undefines all defined macros with the particular name. So after using it, no macro with the chosen name remains.

I am not sure regarding the name of the builtin macro.

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