[oe] [PATCH] [RFC] Add new distutils-native-base class so solve PYTHON_DIR problem for native packages

[Khem Raj]

Hi

I bumped into this problem today. I parsed dependencies for libxml2-native and it was pulling all sort of packages 
which are really meant for target packages e.g. it was pulling in python along with python-native and then this inturn
was pulling in other packages.

This is because we inherit from distutils-base class in the native recipes of libxml2 and same is case with rpm-native

The native recipes infact need less than what distutils-base provides, so I divided this class into 

distutils-common-base which is inherited by distutils-base class and distutils-native-base class (new)

Now we can use distuitls-native-base class for the native packages who need variables like PYTHON_DIR

I fixed zope-native rpm-native and libxml-native recipes. They needed a bit of restructuring.

Now I get correct build deps for these packages.

OK for .dev ?

-- 
Khem Raj

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