package.bbclass: Drop python depends from rpmdeps

package.bbclass: Drop python depends from rpmdeps

This python depends is added by rpmdeps every time it finds a python
script. This is not necessary since we handle this in otherways. It
also breaks things like nativesdk since the dependency is not renamed.
The easiest solution is just to ignore this dependency.

(From OE-Core rev: 5c8ad2638baac0501cecf38f8d3e8467d56afb8a)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>