tap2rpm can't handle .tac files outside the current directory

New submission from TimAllen <[email protected]>:

If I have a .tac file in the current directory, I can package it easily enough:
{{{
tap2rpm -t foo.tac
}}}
But if the .tac file is in a different directory, things don't work:
{{{
# Doesn't work
tap2rpm -t resources/foo.tac
}}}
The .spec file that tap2rpm produces is hard-coding the filename in an awkward way, causing rpm to choke:
{{{
[... other output ...]
+ cp resources/foo.tac /var/tmp/twisted-foo-1.0-root/etc/twisted-taps/
cp: cannot stat `resources/foo.tac': No such file or directory
error: Bad exit status from /var/tmp/rpm-tmp.42424 (%install)
}}}

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Type     : enhancement
Component: core
Keywords : 
Priority : normal
Nosy     : 
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http://twistedmatrix.com/trac/ticket/4088