libpulp: always swap contexts

In cases where the run queue was empty, the trampoline context would
immediately enter the caller context.  Then the trampoline would be
reused again without being re-setup.

This seemed to work fine on Linux but was causing bus errors on OSX.

So instead now enter_context never used and contexts are always
swapped to preserve the state of the context being left, which
seems to have fixed the problem on OSX.

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