Do not include calls to own exports in the Import Table reconstruction

[hasherezade]

During the full Import Table reconstruction (/imp 3), PE-sieve collects all addresses of exports that are being filled in the module, and constructs the table out of them.

However, executables may call their own exported functions. It leads to an undesirable situation when PE's own exports are included in the new import table. Example below:

Such functions should be filtered out and not included in the generated table.

[hasherezade]

Result: the recreated Import Table no longer contains own exports of the dumped PE: