gensio: add patch with workaround for buildbots (refs #24047)

gensio: add patch with workaround for buildbots (refs #24047)

This should solve the issue found on the buildbots:

-snip-
...
checking consistency of all components of python development environment... yes
./configure: line 24172: test: =: unary operator expected
checking for pam_start in -lpam... (cached) no
...
-snap-

For still unknown reason, AX_PYTHON_DEVEL from the included
m4 file is not used which would set the variable the correct way.

Signed-off-by: Michael Heimpold <mhei@heimpold.de>