build: auto-detect the presence of the openat2() syscall

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Let configure detect if the openat2() syscall is supported by the kernel
headers we are building against. Do not attempt to use openat2() if
support is not present.

Users can still disable using the openat2() syscall manually if so
desired.

Signed-off-by: Markus Mayer <mmayer@broadcom.com>

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