remove spurious warnings about reals and fixes oracles

src/plugins/e-acsl/doc/Changelog

...s/e-acsl/tests/e-acsl-runtime/oracle/bts1307.1.res.oracle

...ins/e-acsl/tests/e-acsl-runtime/oracle/bts1307.res.oracle

...s/e-acsl/tests/e-acsl-runtime/oracle/bts1399.1.res.oracle

...ins/e-acsl/tests/e-acsl-runtime/oracle/bts1399.res.oracle

...gins/e-acsl/tests/e-acsl-runtime/oracle/call.1.res.oracle

.../e-acsl/tests/e-acsl-runtime/oracle/localvar.1.res.oracle

.../e-acsl/tests/e-acsl-runtime/oracle/ptr_init.1.res.oracle

...ins/e-acsl/tests/e-acsl-runtime/oracle/valid.1.res.oracle

...ugins/e-acsl/tests/e-acsl-runtime/oracle/valid.res.oracle

...acsl/tests/e-acsl-runtime/oracle/valid_alias.1.res.oracle

...e-acsl/tests/e-acsl-runtime/oracle/valid_alias.res.oracle

...ns/e-acsl/tests/e-acsl-runtime/oracle/vector.1.res.oracle

...gins/e-acsl/tests/e-acsl-runtime/oracle/vector.res.oracle

src/plugins/e-acsl/typing.ml