rpm.spec: bump python dependency to 2.6
We are about to drop 2.4 requirement in Mercurial's setup.py, we bump rpm
dependency first for the sake of smaller changeset. Clean up of the spec file
can come after the dependency is actually dropped.
$ echo 'raise Exception("bit bucket overflow")' > badext.py
$ abspath=`pwd`/badext.py
$ cat <<EOF >> $HGRCPATH
> [extensions]
> gpg =
> hgext.gpg =
> badext = $abspath
> badext2 =
> EOF
$ hg -q help help
*** failed to import extension badext from $TESTTMP/badext.py: bit bucket overflow
*** failed to import extension badext2: No module named badext2
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