bug#8362: make install prefix inserted in source code with generated python files

[A.T.Hofkamp]

Ralf Wildenhues wrote:

Looks like it.  Can you work around this issue by adding

all-local: $(prog_PYTHON)

to the Makefile.am?

Confirmed that this addition fixes the problem for me, both with the 'p' 
example and the real case.
Thanks for the quick fix.

Albert