python: fix build by adding some more patches

The removal of -L flags from TARGET_LDFLAGS in
7e3e8ec0 has trigerred some more
issues with Python, requiring some more hacky fixes.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>