(struct execdata): New members `headbuf', `file_data', `optimal_block'.

(load_section): Copy data from U->file_data if that is nonnull.
Use new subfunction `write_to_task' that handles non-page aligned sections.
(input_room): Fix EOF check.
Use io_read if no memory object.
(prepare): New function, broken out of check.
Initialize E->file_data and E->optimal_block.
Set E->stream.__seen bit.
(check): No longer take FILE arg.
Use E->file_data if nonnull; else read from stream if no memory object.
(finish_mapping): Reset members after deallocating resources.
(finish): Likewise.  Call fclose.  Don't deallocate E->header if it points
to &E->headbuf or E->file_data.
(check_gzip): New function, implements executing gzip'd binaries.
(do_exec): Call prepare before check.
Call check_gzip if file format unrecognized.

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