LDFlags missing ' -lpython2.7'

[brussee]

In case of the PyLevelDB recipe if I comment this line:

env['LDFLAGS'] += ' -lpython2.7'

it breaks on runtime with this error:

I/python(24256): ImportError: dlopen failed: cannot locate symbol "_Py_NoneStruct" referenced by "/data/data/org.tribler.android/files/lib/python2.7/site-packages/leveldb.so"...

It somehow is not added automatically apparently...

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[inclement]

From a quick check, it looks like none of the recipe classes automatically add this (although I thought they did) - does that look the same to you? I don't think there's a reason not to link it automatically in the compiled ones, so if that's right then let's add it in their get_recipe_env.

[AndreMiras]

Yes I also noticed python linking flags seem to be missing in parent recipes.
As of today I only see it in CppCompiledComponentsPythonRecipe.get_recipe_env() and CythonRecipe.get_recipe_env().
This pull request seems to tacle part of it #793.

I think it would greatly improve code base quality and recipes reliability to tackle that one.