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Description of problem:
_missing_doc_files_terminate_build and _missing_doc_files_terminate_build are 
not reread between two build, so if this macro is set into the first specfile, 
it will apply to the second even this is not the default value. 

Version-Release number of selected component (if applicable):
rpm-4.4.1 (cvs include)

How reproducible:
Always

Steps to Reproduce:
1. create two spec file, in first set both macro to, in second, create, 
voluntary forgot a file into %files 
2. build both 
3. the second spec build should failed, but the first set still apply  
   

Actual Results:  - untrapped errors  

Additional info: