qga: Clean up includes

This commit was created with scripts/clean-includes.

All .c should include qemu/osdep.h first. The script performs three
related cleanups:

* Ensure .c files include qemu/os

qga: Clean up includes

This commit was created with scripts/clean-includes.

All .c should include qemu/osdep.h first. The script performs three
related cleanups:

* Ensure .c files include qemu/osdep.h first.
* Including it in a .h is redundant, since the .c already includes
it. Drop such inclusions.
* Likewise, including headers qemu/osdep.h includes is redundant.
Drop these, too.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Konstantin Kostiuk <kkostiuk@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Message-Id: <20230202133830.2152150-11-armbru@redhat.com>

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qga: add qga_open_cloexec() helper

QGA calls qemu_open_old() in various places. Calling qemu_open() instead
isn't a great alternative, as it has special "/dev/fdset" handling and
depends on QEMU int

qga: add qga_open_cloexec() helper

QGA calls qemu_open_old() in various places. Calling qemu_open() instead
isn't a great alternative, as it has special "/dev/fdset" handling and
depends on QEMU internal monitor data structures.

Instead, provide a simple helper for QGA needs, with Error* support. The
following patches will make use of it.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20220525144140.591926-6-marcandre.lureau@redhat.com>

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