Remove invalid shebang line

ydiff.spec.in

@@ -22,6 +22,7 @@ Python library that implements API used by ydiff tool.
 
 %prep
 %autosetup -n %{name}-%{version}
+/usr/bin/sed -i '/#!\/usr\/bin\/env python/d' ydiff.py
 
 %build
 %py2_build