Makefile.common change

[Dennis Gilmore]

The way we currently check for branches is broken at release time.  everything 
that was tagged in devel that was branched for F-9  when you try and build in 
koji gets a disttag of .fc10 and fails to build due to a mismatch.  this has 
been a minor issue in the past.  but it is a big issue for secondary arch 
rampup.  

Makefile.common checked for the existence of a branch file which devel does 
not have. it is added at branch time.   long term we probably need to add 
some logic so that we always have a branch file and check it and fall back to 
this method if its not there.  it will help with always being able to 
reproduce a srpm.  

Since this is somewhat invasive i wanted to run it by people first.  it  
worked ok in my testing.

Dennis
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