[e-acsl] never monitor function pointers

src/plugins/e-acsl/src/analyses/memory_tracking.ml

src/plugins/e-acsl/tests/bts/oracle/gen_issue-eacsl-91.c

...ns/e-acsl/tests/concurrency/oracle/gen_parallel_threads.c

.../e-acsl/tests/concurrency/oracle/gen_sequential_threads.c

...ugins/e-acsl/tests/concurrency/oracle/gen_threads_debug.c

...csl/tests/concurrency/oracle/gen_threads_safe_locations.c

src/plugins/e-acsl/tests/full-mtracking/oracle/gen_addrOf.c

src/plugins/e-acsl/tests/memory/oracle/gen_vdso.c

src/plugins/e-acsl/tests/temporal/oracle/gen_t_fptr.c