Improve lseek handling (#2564)

Improve lseek handling (#2564)

The skip functions are limited to 1 GB for cases in which libarchive
runs on a system with an off_t or long with 32 bits. This has negative
impact on 64 bit systems.

Instead, make sure that _all_ subsequent functions truncate properly.
Some of them already did and some had regressions for over 10 years.

Tests pass on Debian 12 i686 configured with --disable-largefile, i.e.
running with an off_t with 32 bits.

Casts added where needed to still pass MSVC builds.

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Signed-off-by: Tobias Stoeckmann <tobias@stoeckmann.org>