Remove IFS binding masking a non-zero status code

In project_action_arguments_recursive(), IFS bindings needed to be
reworked in order to avoid a situation where, for example,
project_extract() would fail to extract source archives (because they
didn't exist), returning a status code of 1 only for it to be masked
by a rebinding of IFS--which would always succeed.

ifs_save and IFS were made local variables in
project_action_arguments_recursive() in order to avoid the need to
rebind IFS after the for loop returns.

This patch makes './libreboot sources <project>' functional.

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