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v4l2: Define ioctl_req_t for posix/linux case

Khem Raj requested to merge kraj/gstreamer:clang16 into main

this is an issue seen with musl based linux distros e.g. alpine [1] musl is not going to change this since it breaks ABI/API interfaces Newer compilers are stringent ( e.g. clang16 ) which can now detect signature mismatches in function pointers too, existing code warned but did not error with older clang

Fixes gstv4l2object.c:544:23: error: incompatible function pointer types assigning to 'gint ()(gint, ioctl_req_t, ...)' (aka 'int ()(int, unsigned long, ...)') from 'int (int, int, ...)' [-Wincompatible-function-pointer-types] v4l2object->ioctl = ioctl; ^ ~~~~~

[1] https://gitlab.alpinelinux.org/alpine/aports/-/issues/7580

Signed-off-by: Khem Raj raj.khem@gmail.com

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