Timing problem with '%buildsubdir'

[Andreas Scherer]

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Why is macro '%buildsubdir' not available in section '%prep'?

According to the comment in 'macros[.in]', '%buildsubdir' is "set
after processing %setup", but there seems to be a timing problem in
setting and resolving this particular item.

   %prep
   %setup -c
   %{echo:<<<PREP:%buildsubdir>>>}

produces "<<<PREP:%buildsubdir>>>, i.e., the macro is _not_ set at
this point, while a later

   %build
   %{echo:<<<BUILD:%buildsubdir>>>}

produces the expected <<<BUILD:sgb-20090810>>>. (Using
'https://github.com/ascherer/sgb/blob/local/sgb.spec' as example.)

Internally, 'doSetupMacro()' uses 'spec->buildSubdir' for referencing
the project building area, and calls 'addMacro(...,"buildsubdir",...)'
on the way.
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