[E-ACSL] do not call __clean when not required + ongoing manual

src/plugins/e-acsl/tests/e-acsl-runtime/oracle/gen_lazy.c

src/plugins/e-acsl/tests/e-acsl-runtime/oracle/gen_lazy2.c

...ns/e-acsl/tests/e-acsl-runtime/oracle/gen_linear_search.c

...s/e-acsl/tests/e-acsl-runtime/oracle/gen_linear_search2.c

...-acsl/tests/e-acsl-runtime/oracle/gen_nested_code_annot.c

...acsl/tests/e-acsl-runtime/oracle/gen_nested_code_annot2.c

src/plugins/e-acsl/tests/e-acsl-runtime/oracle/gen_not.c

src/plugins/e-acsl/tests/e-acsl-runtime/oracle/gen_not2.c

src/plugins/e-acsl/tests/e-acsl-runtime/oracle/gen_null.c

src/plugins/e-acsl/tests/e-acsl-runtime/oracle/gen_null2.c

.../e-acsl/tests/e-acsl-runtime/oracle/gen_other_constants.c

...e-acsl/tests/e-acsl-runtime/oracle/gen_other_constants2.c

src/plugins/e-acsl/tests/e-acsl-runtime/oracle/gen_quantif.c

...plugins/e-acsl/tests/e-acsl-runtime/oracle/gen_quantif2.c

src/plugins/e-acsl/tests/e-acsl-runtime/oracle/gen_result.c

src/plugins/e-acsl/tests/e-acsl-runtime/oracle/gen_result2.c

src/plugins/e-acsl/tests/e-acsl-runtime/oracle/gen_sizeof.c

src/plugins/e-acsl/tests/e-acsl-runtime/oracle/gen_sizeof2.c

...ns/e-acsl/tests/e-acsl-runtime/oracle/gen_stmt_contract.c

...s/e-acsl/tests/e-acsl-runtime/oracle/gen_stmt_contract2.c