[PATCH] buildtools: Use separate storage for each function in runonce

[Petr Viktorin]

Hello,
I ran across this curiosity while trying to wrap my head around the 
build system:

     @runonce
     def add_one(x):
         return x + 1

     @runonce
     def sub_one(x):
         return x - 1

     add_one(1) # returns 2
     sub_one(1) # also returns 2!


Fix attached.

-- 
Petr Viktorin
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