pyhbac: Fix warning Wdiscarded-qualifiers
The macro PyDoc_STRVAR changed in python 3.8
and it defined variable with const modifier
src/python/pyhbac.c: In function ‘PyInit_pyhbac’:
src/python/pyhbac.c:1948:25: warning: passing argument 2 of
‘sss_exception_with_doc’ discards ‘const’ qualifier from pointer
target type [-Wdiscarded-qualifiers]
1948 | HbacError__doc__,
| ^~~~~~~~~~~~~~~~
In file included from src/python/pyhbac.c:27:
./src/util/sss_python.h:33:1: note: expected ‘char *’ but argument
is of type ‘const char *’
33 | sss_exception_with_doc(char *name, char *doc, PyObject *base, PyObject *dict);
| ^~~~~~~~~~~~~~~~~~~~~~
Reviewed-by: Pavel Březina <pbrezina@redhat.com>\