Remove CFLAGS (noarch package) and add dep for docs package => main

package as pointed out in review of the python-nose1.1 compat package

python-nose.spec

@@ -60,6 +60,7 @@ output capture and more.
 Summary:        Nose Documentation
 Group:          Documentation
 BuildRequires:  python-sphinx
+Requires: python-nose
 
 %description docs
 Documentation for Nose
@@ -106,7 +107,7 @@ cp -a . %{py3dir}
 
 %if 0%{?with_python3}
 pushd %{py3dir}
-CFLAGS="$RPM_OPT_FLAGS" %{__python3} setup.py build
+%{__python3} setup.py build
 popd
 %endif # with_python3