[sympy] Fix XFAIL import in test failure workaround.

[Jerry James]

commit 61fcaaf6baac877b69b6a1adfa103dec5ae8dffb
Author: Jerry James <jamesjer at betterlinux.com>
Date:   Fri Dec 5 13:04:26 2014 -0700

    Fix XFAIL import in test failure workaround.

 sympy.spec |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/sympy.spec b/sympy.spec
index 336d352..dc30fef 100644
--- a/sympy.spec
+++ b/sympy.spec
@@ -94,7 +94,7 @@ cp -a . %{py3dir}
 # One plotting test expects one warning, which happens with python < 3.4, but
 # the same warning is triggered in a different spot with python 3.4, leading
 # to an assertion failure.
-sed -e 's/import warnings/&, XFAIL/' \
+sed -e '/import warnings/ifrom sympy.utilities.pytest import XFAIL' \
     -e '/^def test_matplotlib():/i at XFAIL' \
     -i %{py3dir}/sympy/plotting/tests/test_plot_implicit.py