qemu: Allow native and nativesdk versions on Linux older then 4.17

qemu: Allow native and nativesdk versions on Linux older then 4.17

Linux kernel 4.17 introduced two new mmap flags, MAP_FIXED_NOREPLACE and
MAP_SHARED_VALIDATE.  Starting with QEMU 8.1, these flags are now used
and required for proper system operation.  In order to build and run on a
system older then 4.17, we need to emulate this new behavior.

Not having a newer kernel could result in the mmap memory being allocated
in a way that will cause failures without QEMU checking for these
conditions.  Note, memory allocation issues are rare in my experience so
this is more of a 'just-in-case' behavior.

SDK_OLDEST_KERNEL is currently set to 3.2.0, the only way this can claim
that qemu works in an SDK is by checking the return values to emulate
the expected behavior.

Signed-off-by: Mark Hatle <mark.hatle@amd.com>
Signed-off-by: Mark Hatle <mark.hatle@kernel.crashing.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>